lmso

Laugh my fucking soul out.
Used by lazy people who have a good sense of humor.

lmso - sent after someone sends a meme, a vine, or a funny joke.
lmsooooooooooo - sent after something EXTREMELY funny

ofc

Used as an abbreviation for of fucking course.
Used by lazy ass people who don't feel like typing of fucking course.

In a sentence:
Ofc who tf wouldn't.
Ofc I hate him/her