Just Fucking Google it. You say it when somebody asks a stupid question.
Dude #1: hey dude, what does JFGI mean?
Dude #2: Just Fucking Google it yo.
Dude #1: I tried but i couldn't find anything.
Dude #2: JUST FUCKING GOOGLE IT!
Dude #1: bro. i already tried that. don't be mean.
Dude #2: bro, your an idiot.