The action of pounding a person's ass to the point their cheeks turn red without slapping them.

To get Your shit rocked by a closed fist.

To get your ass kicked REALLY badly. If you got "duffed", you didn't just get punched in the face, hit the floor and kicked once or twice hard... you got hit in the face, hit the ground, then got hit in the face several more times, possibly had your head bashed into the cement, got kicked in the ears, neck, kidneys and various other soft spots on your body.

to demolish, destroy , beat down, kill, or win against an oppenent

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.

a savage punch or stomp to the face , stomach or vagina

ex- "ha..this shit sounds like the blue's.... ya that's right black and blue's all over your fuckin face, when you get DUFFED! fuckin bitch! WHAT!" - necro

Getting so drunk to the point where your blacked out and raising any kind of hell possible. Getting Duffed usuall ends with pissing your pants after you pass out