Ass, Pussy, Mouth. Apm is penetrating all of these orifices at once, while making sure that the balls don't touch.
A song by Spamtec, off their album "STC is the Greatest"
"Ass Pussy Mouth, Ass Pussy Mouth, It Ain't Gay if the Balls Don't Touch."
"Get Some Butt, Get Some Vag, Get Some Motherfucking Brain."
"Pull up, Slow up on This Grand Am and Gangbang, This Bitch While She Do a Handstand, Thats APM."