crack up

(phrasal verb) to laugh a lot

Example Sentences:

Friend 1: If I tell you something, do you promise not to crack up?
Friend 2: Okay.
Friend 1: I got fired last night for sleeping on the job.
Friend 2: That’s ridiculous!

A: What did you do last night?
B: I went to see a comedian.
A: Was he any good?
B: Yeah, he had some funny jokes. Everyone was cracking up!

The audience cracked up while watching the comedy, Knocked Up.

Media:

Similar idioms:

1. hold one’s sides
2. in stitches
3. riot
4. get cracking
5. LOL
6. ROTFL
7. LMFAO