so man fo

1. To beat someone up really badly

2. In game term. To Kill/PK that person.

1. dude - Yeah man, what happened there?
dude 2 - Oh , right i just so man fo'd that kid

2. dude - * comes and kills you while you're afk*

dude 2 - WTF MAN! i'M GONNA SO MAN FO THAT BISH! * runs and PKs that kid.