Commonly when used to define the father / fathers of inbred people. These men often have no sexual standards and will do just about anything for a shag, even if that means going for their sisters / cousins.

May also commonly be used in replace of haha when someone's fingers are too chode like to properly type on their keyboard. It is a sign that you, yourself are small and are not able to grow above 5ft 2".
(David) Hey Chris, did you know John's dad is married to his sister?

(Chris) apapapapapa you're joking, right?
(Chris) Oops, I meant hahahahaha!
(David) No, his dad is an apapapapapa.
by BigStinkyShamima April 4, 2020
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