Used to describe someone who is extremely good at Anal
sex be it receiving or giving or both, sometimes better than oral
sex or vaginal
sex
girl 1 : "you were
right he
left my ass sore and my pussy sopping, never thought anal could feel that good"
girl 2 : "Told you he was a assmancer, whenever we do it he leaves me soaking the bed"
"dat was S-class
ass, damn she a true assmancer, had me busting under minute"