also Total and undeniable dominance of a person, group of people or situation as to make them/it akin to ones bitch.
You were really neffed when you walked in on your girlfriend cheating on you.
1.To be fucked in a bad way, like in the ear.
2.The act of getting fucked, being fucked over, or fucking someone over.
3. doing something shitty or simply being a dick
See also : Mother neffer & neffed up
2. You mother-neffer! you ate the last slice of pizza
3. if you get left at the alter that neffed up.
4. having sex with someone and not disclosing
venereal diseases means you'll be neffed for life.
5. thus far the ultimate neff is inviting a girl to a lake house and then neffing her wing man... in the ear
- the wing man becomes a mother-neffer leaving the other girl to be NEFFED by the circumstances