look up any word, like dirty sanchez:
 
1.
Laughing So Hard That I Farted.
LSHTIF! What made you think that they are dating?
by Laughing Like Crazy December 18, 2010
 
2.
An acronym standing for "Laughed So Hard That I Farted."

It should be used in place of related acronyms such as "LOL", "LMAO", "ROFL", etc.
Through text:

Bro 1: Hey bruh bruh! Our bro Rufus is hitting on my mom in the kitchen!

Bro 2: LSHTIF! Shut it down, bruh!
by TheBruh August 19, 2013