It means "Wrong F*cking Forum"
It's when sonmeone posts a comment in the wrong area.
In a car enthusiast's Forum-
n00b: "Did you see what (politician)did?
Dude: STFU n00b! WFF!
16👍 21👎
“Mikey imagine this gyal want me too up she phone and me never even see the wife”….mek them know “wff”.