Shortened form of "Faggot Motherf*cker", intended to infer that the person in question not only takes it in the pooper himself, but also gives it to his mom in the fudgetunnel. Very derragatory, much more so than "ghey"
<l0534r> HHA I JUST PINGED SOEMONE AT 127.0..01!!!1 L000L!
<User0101> Dear Jebus, some op please kickban this fagmo!