What is Stfucku?
A combo of STFU (Shut The Fuck Up) FU (Fuck You) and FUCKu.... (Fuck You)
Used to tell one person all these things without typing them all....
Larry: Dude! I can't believe your girlfriend dumped you!
Gary: Dude why don't you STfuCKu!
See shut, the, fuck, up, stfu, fu