Stands for Almost Jizzed In Pants.

When something so amazing happens that you almost jizz in your pants out of wonder and happyness. Can be used for both sexual and non-sexual things.
Man, that movie was so amesome! I ajiped when that one guy ripped the other guys head off!

or

I was making out with my girlfriend the other day and it was getting pretty serious, i ajiped.
by Yahtzee McGee October 30, 2009
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