Double Laugh 

When someone type's "haha lol" when referring to their laughter. It is when they giggle at first but upon realizing that it is actually quite funny they burst out in laughter.

Damien- "And then the duck said MOO."
Lucy- "haha lol"
Damien- "You just double laughed XD"

Double Laugh by JPer325 May 2, 2011

Double Laugh Syndrome 

Double Laugh syndrome is defined as laughing at ones own joke while currently laughing yourself. Causing an intense tingling sensation in the nether region as well as confusion from Australiens.

Telling someone that the person laughing behind you is actually you, telling them it's Double Laugh Syndrome, and having them believe it.

Double Laugh Syndrome by Gryphus_1 May 5, 2014

Double laughative 

Like a double negative in sentences, it means that there is two references to laughter in a sentence when typed via chat, email, or text message

Sam: Why did the chicken cross the road?

Sally: IDK

Sam: to get to the other side!

Sally: hahaha that's so funny lol

Sam: omg! you just used a double laughative! stop that!

Double laughative by volleydancerash February 7, 2010