stands for Supreme Master First Class. A rank used in Counter-Strike: Global Offensive game.

suck my fucken cock.

Acronym for Suck My Cock/Cunt/Clit (smfc)

swallow my fucking cum

Sphagetti Monster Fucking Carbonera

Carbonera is a delicious bacon-based pasta sauce. This phrase is used where one might otherwise encounter JFC, or "Jesus Fucking Christ", if one were more traditionally inclined.