Top definition
Acronym: AIS

A poker analogy which applies to a one night stand that's dragged out because the girl still hasn't given it up.

The player feels they've invested too much to back out now.
John: What's Doug still doing with that girl? It's been 2 months and he still hasn't sealed the deal.

Mike: He's got classic All in Syndrome, he's spent weeks as her 'boyfriend' and has yet to reap any benefits.

John: That's weak, he needs to man up and cut his losses.

Mike: Agreed.
by LongfeatherTheGreat July 05, 2010
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