Poon is the new nickname for an idiot. but it is used amongst friends. it is not used to emotionally scar dorks.
Don't be a poon all your life man Shameek!!
Used by gangsters, pimps, players, etc, to express their tiredness from sexing too much.
"yo Kyle, we hitting da club tonight, then gonna keep some ladies entertained. you wanna ride?
"ah no thankz man, I was with Keisha da hol weekend. Im all G-d out."