LFSU 

An extremely terrible and salty Youtuber with no friends.

He's just another LFSU playz fan.

LFSU by [L.F.S.U] nvsgto October 17, 2016

LFSU 

An acronym that stands for "Let's Fuck Shit Up". Used when full of adrenaline and wanting to vandalize.

"Dude im soo pumped!!! LFSU!!!!!!!!"

LFSU by ItsAlwaysSunny December 13, 2009