A person of moronic stature, generally a new boyfriend of your ex-girlfriend that you find to be a total idiot.
Yeah, she's dating some new guy that sells Saturn's. He's a chucklehead.
The progressive stages of advancement and rejection in the make out process (Go for Boobs = Offense, Get pushed away = Defense)
Kelby: Did you score?
Pete: No, I just played offense-defense all night....
To shit oneself while shopping at Wal-Mart
Sorry honey, we gotta hit the road... I just shmarted all over the kid playing Playstation