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I often hear the "Did not! - Did too!" in TV series and films.

I know perfectly well what it means but why is it the word "too"?

As best as we know "too" stands instead of "indeed/so" and implies an affirmative statement! It's much shorter to use in spoken English!

I believe it is an idiom of some kind but I couldn't find it!

Example:

Brother: Mom, Linda kissed a boy at school today!
Sister: Did not!
Brother: Did too!

I often hear the "Did not! - Did too!" in TV series and films.

I know perfectly well what it means but why is it the word "too"?

As best as we know "too" stands instead of "indeed/so" and implies an affirmative statement! It's much shorter to use in spoken English!

I believe it is an idiom of some kind but I couldn't find it!

I often hear the "Did not! - Did too!" in TV series and films.

I know perfectly well what it means but why is it the word "too"?

As best as we know "too" stands instead of "indeed/so" and implies an affirmative statement! It's much shorter to use in spoken English!

I believe it is an idiom of some kind but I couldn't find it!

Example:

Brother: Mom, Linda kissed a boy at school today!
Sister: Did not!
Brother: Did too!

1
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Did not! - Did too!

I often hear the "Did not! - Did too!" in TV series and films.

I know perfectly well what it means but why is it the word "too"?

As best as we know "too" stands instead of "indeed/so" and implies an affirmative statement! It's much shorter to use in spoken English!

I believe it is an idiom of some kind but I couldn't find it!