LSF 

stands for "Livestream Fail" is a term used in twitch community.
Viewers usually post a streamer clip to /r/livestreamfail reddit.

"Have you seen his latest clip in LSF? It's so cringey."

LSF by Moonbyeol1421 June 9, 2019

LSF 

lick suck fuck

LSF=
lick
suck
fuck
lick suck fuck
oh-la-laa

LSF by Woburn Footballer October 29, 2011

LSF 

Last Stand Faggot. A person, preferably in COD MW2, who uses the last stand perk, and has a chance to get back up. This is very unrealistic and stupid. These people get put in last stand and hide around a corner and stop someone of their killstreak.

Danm it! that son bitch LSF laying on the ground! Someone get eem!

LSF by ChicoLegend March 24, 2011

LSF 

A phrase used by Mr. Simon Lo ( a teacher in LSC ). LSF represents a Cantonese phrase. The phrase means 'to scrap of a person's butt'. If a student forgets to hand in homework assigned by Mr. Simon Lo, he will curse the student to LSF.

Mr. Lo: You forgot to hand in your homework. Now you will LSF!
Me: No! I don't want my butt to be scrapped off!

LSF by DirtyUtensilsAreDirty October 26, 2020

LSF 

If you're looking this up, you cannot guess Parren's nickname and you came here to look for it. Bad news buddy, its not here.

Guy 1: "Hey man, i've been wondering for awhile now what does LSF stand for?"
Parren: "You gotta guess, I cant tell you"

LSF by lilhanklsf April 13, 2020

LSF 

lying shit face

some person keeps lying to you and when you've reached the limit of their lies you go "fuck it, you're an LSF". the word is then used on the person =)

LSF by x3Pleasure March 23, 2011

LSF 

It means Listen so Forth as in

"I hate you"
"LSF STFU"

LSF by Ulisis March 10, 2007