An ass lap is when a girl has an ass so big that it creates a make-shift lap in the back which can be used as a
shelf, or a inconvenient place for a
cat to take a
nap.
Hey, I
set my beer down for a second and now it'
s gone. Did you see where it went?" "Yeah man, it's over there, you set it on Amanda'
s ass lap and she walked away." "Oh shit man, my bad.