lsmif 

laughing so much i farted.

Joyce: You know what? She fell in the pool!
Andrea: LSMIF! are you serious?

lsmif by Geik September 27, 2007

Lsmic 

An internet short for "laughing so much I'm crying" Possibly made up by the youtuber "thewinekone" in his video "yours randomly"

More believable than ROFL

Mike: ... and then he ate it!
Charlie: LSMIC

Lsmic by Jessha October 24, 2007

LSMISOYNK 

Modern term like LOL or ROFL, meaning:

"laughing so much I stomped on your new kitten".

A popular phrase, which definitely needed shortening to an easy to remember version like LSMISOYNK.

Person 1: I found that bloke in a public toilet, "having fun" with baked beans

Person 2: LSMISOYNK

LSMISOYNK by Backrub the terrorist June 6, 2010

Lshifomdjkidhadbiidinhw

Laughing so hard I fell off my dinosaur, just kidding I dont have a dinosaur but if I did I'd name him Wilburt.

Guy 1: why don't oysters give to charity ? ...... Because they're shell fish ! Guy2 : omg Lshifomdjkidhadbiidinhw :-D

Lshifomdjkidhadbiidinhw by evil-rules January 3, 2012

LSMFT 

"Lucky Strike Means Fine Tobacco" was the ad slogan in the '50s & 60s.
Young boys at the time, like me, said it stood for , "Let's screw, my finger's tired."

As in : "Hey sweetie, LSMFT!"

LSMFT by D. Millsaps November 14, 2006

LSHIFOMDJKIDHADBIIDINIW 

Acronym for Laughed So Hard I Fell Off My Dinosaur Just Kidding I Don't Have A Dinosaur But If I Did I'd Name It Wilburt.

That's so funny I LSHIFOMDJKIDHADBIIDINIW.

LSHIFOMDJKIDHADBIIDINIW by Neon Dinosaur July 25, 2011

LSMINHAHA 

Acronnym for Laughing So Much I Nearly Had A Heart Attack

Often used as either a melodramatic, or sarcastic remark.

Janet: "...And Then The Priest Walked In On Them!"

John: "Ha, LSMINHAHA"
or
John: "Wow, Rofl, Lmao, Lsminhaha... NOT! ¬¬"

LSMINHAHA by Jayisfap January 20, 2010