An internet slang term meaning laughing but super furious.
I forgot my homework at home, lbsf.
I tried a lame pick up line on the girl I like and it didn't work, lbsf.
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Laughing but so fuckkin serious...
me: stop, don't tickle me
boyfriend: come on bay, i wanna see you smile.
Me: smilin these nuts, don't touch me
Boyfriend: come on
Me: lbsfs GONE bay damn
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