omg, I thought it mean StopFoo, haha, lol.
Actually means : Shut The Fuck Up
I was joking around on myspace and sent this guy 20 messages. He wrote back and said "STFU, I don't even talk to u!". I thought that meant "StopFoo" hehe. I'm so stupid sometimes!
the acronym of what you say to someone who spells this out in a real life conversation and other overused acronyms like wtf rather than saying the real thing
fag: stfu (spells out stfu) I only kiss that other guy cause uh..it's my religion so wtf (spells out wtf) you talking about I'm not gay.
me: No YOU shut the fuck up you don't even know proper english AND you kissed a guy, fag.