LSTM 

Laughing-Silently-To-Myself. The REAL alternitive to LOL, because really how often are you laughing out loud when you type LOL. Exactly. Not too often. And when you are laughing out loud, use LOL, otherwise: LSTM.

Sue: hey brad, guess what?
Brad: what?
Sue: I have Herpes :(
Brad: LSTM
Sue: That wasn't a joke!!
Brad: oh . . . sorry . . LOL!

LSTM by !jkmc? July 2, 2009

lstm 

laughing silently to myself
like when ur on aim but u really aint lauging out loud u use this cuz its funny but that not funny

steven :pete's snoring

ada :lstm

lstm by Steven To September 20, 2007

lstm 

laugh silently to my self

did u see joey today? lstm

i didnt want to be rude so i had to lstm.

u failed ur test? lstm

lstm by _irdc_ January 5, 2012

lstm 

laughing sinisterly to myself

im a steal your car... lstm

lstm by Kelmasonly April 8, 2009

LSTMS

'Laughing silently to myself.'

Because sometimes "LOL" is a lie.

"Your mom."
"LSTMS." -dies a little inside-

LSTMS by Danime-33 December 24, 2007

LSTMF 

Abreviation of laughing silently to my self.

The comment on Youtube­­­© was funny so I LSTMF'ed.

LSTMF by John Deecon July 23, 2009

lstmwtahy

Laughing silent to my self while thinkig about hugging you

Me: What are u doing?
Her: LSTMWTAHY.
Me: KK!

lstmwtahy by mtygesen6 March 30, 2018