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Is the phrase "better have my money" grammatically correct as in the title of the song found in the following link?

http://www.azlyrics.com/lyrics/rihanna/bitchbetterhavemymoney.html

Or

Should it be "had better have my money"?

Update. I must say that I'm not trying to judge nor trying to correct the song just trying to learn the right way to use this phrase just in case I need to use it. While it has been metioned in the comments that songs often use a lot of slang is good to know the right version of them. Right now I'm just interested in knowing grammatical version of the title phrase since I think it'll be useful for when I lend money to someone.

Is the phrase "better have my money" grammatically correct as in the title of the song found in the following link?

http://www.azlyrics.com/lyrics/rihanna/bitchbetterhavemymoney.html

Or

Should it be "had better have my money"?

Is the phrase "better have my money" grammatically correct as in the title of the song found in the following link?

http://www.azlyrics.com/lyrics/rihanna/bitchbetterhavemymoney.html

Or

Should it be "had better have my money"?

Update. I must say that I'm not trying to judge nor trying to correct the song just trying to learn the right way to use this phrase just in case I need to use it. While it has been metioned in the comments that songs often use a lot of slang is good to know the right version of them. Right now I'm just interested in knowing grammatical version of the title phrase since I think it'll be useful for when I lend money to someone.

1
source | link

Is the phrase "better have my money" grammatically correct'?

Is the phrase "better have my money" grammatically correct as in the title of the song found in the following link?

http://www.azlyrics.com/lyrics/rihanna/bitchbetterhavemymoney.html

Or

Should it be "had better have my money"?