LMFAO

(slang) (internet slang) laughing my fucking ass off

Example Sentences:

A: Did you see that funny youtube video?
B: LMFAO, it was hilarious!

When I went to the comedy club, I was LMFAO. The comedian was hilarious!

From the Blogs:

LMFAO rocks the show

Media:

Similar idioms:

1. ROTFL
2. LMAO
3. LOL
4. riot
5. smart ass
6. in stitches
7. on the rocks (2)
8. hold one’s sides
9. laughter is the best medicine
10. on the rocks
11. NSFW
12. ass
13. BFD