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Because it's a curt colloquialism that relies on physical context for its specificity and clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as with a slight nod of your head in his general direction, or by turning away from the fellow to address your interlocutor. The demonstrative adjective does this pointing virtually.

Certainly you could say "That fellow seems quite unbalanced..." or "The fellow seems quite unbalanced".

Because it's a curt colloquialism that relies on physical context for its specificity and clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as with a slight nod of your head in his general direction, or by turning away from the fellow to address your interlocutor. The demonstrative adjective does this pointing virtually.

Certainly you could say "That fellow seems quite unbalanced..."

Because it's a curt colloquialism that relies on physical context for its specificity and clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as with a slight nod of your head in his general direction, or by turning away from the fellow to address your interlocutor. The demonstrative adjective does this pointing virtually.

Certainly you could say "That fellow seems quite unbalanced..." or "The fellow seems quite unbalanced".

2 added 5 characters in body
source | link

Because it's a curt colloquialism that relies on physical context for its specificity and clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as with a slight nod of your head in his general direction, asor by turning away from the fellow to address your interlocutor. The demonstrative adjective does this pointing virtually.

Certainly you could say "That fellow seems quite unbalanced..."

Because it's a curt colloquialism that relies on physical context for its clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as a slight nod of your head in his general direction, as the demonstrative adjective does virtually.

Because it's a curt colloquialism that relies on physical context for its specificity and clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as with a slight nod of your head in his general direction, or by turning away from the fellow to address your interlocutor. The demonstrative adjective does this pointing virtually.

Certainly you could say "That fellow seems quite unbalanced..."

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source | link

Because it's a curt colloquialism that relies on physical context for its clarity.

Dude's got a bad attitude!

It means "That fellow" in your example and "That dude" in this one. The person you're speaking with knows who you are referring to since you are both present, and your body language may even be gesturing in some way towards the fellow, such as a slight nod of your head in his general direction, as the demonstrative adjective does virtually.