What does AIS mean?
Ass In Seat
Other definitions of AIS:
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How to use the term AIS:
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More slang terms:

PYHOOYA
Pull your head out of your ass

BACKFLIP
a term of excitement; to jump for joy; literally jump backwards with your feet flipping over your head.

LSHIAPMP
Laughing so hard I almost peed my pants

NOTY
no thank you