Duffed (v) - The act of getting used and or manipulated by an attractive, mentally unstable person of the opposite sex. Unfortunately this includes an abundance of flirting, profound mixed messages, and sexual enuendos that don't actually lead to SEX, merely the illusion that it will. The Duff usually ends by the Duff-er getting back together with their original girl/boyfriend, leaving the duff-ee with a killer case of blue balls/dry-gina.

when your owned by an elderly gentleman

DuFFing is a sexual act in which two men simulataneoualy ejaculate on each other's testicles and then proceed to 69 in order to lick their semen off the other mans balls.

Taken from last name of "supposed" pop sensation Hillary Duff. ...When the loss of one's innocence is suddenly cool and popular. ...Drastically becoming something your not overnight.

Female equivalent of beating up. Not so violent and involves a lot of pushing and the occasional pinch. From the series "Confessions of Georgia Nicholson".

A girl who is always loud and can make everyone and anyone happy. She is always cheerful! She loves playing sports, manly hockey and baseball and is an amazing player. She is always there for her bestfriends. She is a great student but, sometimes doesn't have the best common sense. She is blonde and blonde at heart. In conclusion, she is an AMAZING PERSON!!

duffing up is the female equivelant of beating up, or kicking ass. It's not so violent in a sense, and to a certain degree. It usually involves excessive screaming, clawing, pushing, and shit-talking.