m0f0
A shortened term for 'mother-fucker' but also in l33t, using zero's instead of plain 'O's.
What up m0f0? - What's up mother-fucker? (a greeting)
Fuck you, m0f0! - Fuck you mother fucker! (an insult)
Fuck you, m0f0! - Fuck you mother fucker! (an insult)