look up any word, like cleveland steamer:
 
1.
The box from which laughter is emitted.
My laugh box is horny for Rebekah's laugh box.
by Me!!!!!!!!!!!!!!!!!!! February 06, 2010
 
2.
The little box inside your throat that makes you laugh.

Sometimes it is referred to as the LOLbox.

Causes joy in life.
Heather Havoc™: OMG I just laughed SO hard
I think a had a spasm in my laughbox.
by alex elaine. March 17, 2009