Die laughing
Definition 1 of 1
Pro Tip 1/3Colloquial Usage
Used in casual conversation among friends, not in formal settings like business meetings or presentations. 
When she tripped over her own feet, we all thought we’d die laughing.
Pro Tip 2/3Figurative Speech
'Die laughing' is an exaggeration, it means to laugh a lot, not literally dying. 
I was watching a stand-up comedy last night; I almost died laughing.
Pro Tip 3/3Positive Emotion
Indicates a very positive reaction to humor; represents extreme amusement. 
You'll die laughing when you see his Halloween costume.