ass

(1)noun: butt; posterior; anal area.
(2)adjective: bad; trashy, used to describe something that is bad or does not reach expectations.

(1) person: *grabs girlfriends butt* girlfriend: did you just grab my ass?
(2)*playing basketball* "yo this ball is ass!"

penis

a small, unopposable eleventh finger that protrudes from in between the legs of male humans and mammals.

hey kids, you manna see my penis?