When a man's penis recieves pleasure by the movement of a hairy or stubby arm pit. Preferably a female armpit. (armpit pit job).
Hey guys it turns out my girflriend hasnt been shaving her armpits for the last few weeks so she could give me a wicked A.P.J.!!
by D-Mart November 13, 2005
Stands for acidic pussy juice. A disturbingly rancid fluid leaked from a mothers vagina. This is particularly gross on a hot summer day.
Yo man, tell your mom to clean up that APJ or I won't be swingin by at my normal time.
by TheDuggan June 11, 2009