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1.
When you think of something funny that happened any given time frame in the past and laugh at it again but to your self. It could be re-reading a message, or remembering a funny action which was already laughed at.
Yo i just thought of what u said the other day and had a re-laugh.

You know when you fell that night... yeah i just had a re-laugh.

I just re-laughed reading your text.
by kaptainsk September 14, 2009
 
2.
When you, while fondly thinking back on a humorous statement or situation, find yourself once again laughing out loud at the absurdity of it all.

Aslo; relapsing into a fit of uncontrollable giggles from which you only just recently recovered.

NOTE* This does not apply in situations that did not initially cause you to laugh. "One day we will look back on this and laugh" situations are right out.
You put curried mayonnaise on your mango sandwich yesterday. I still can't believe you thought it would taste good. I'm seriously having a major relaughs right now.

I used to think that the comedic offerings of Mitch Hedberg were fantastic. I'd pretty much all but forgotten about him for a couple of years. Now I am going through a total relaughs and listening to all of his material!
by BigAbboTT January 19, 2010
 
3.
Relaugh.

To Laugh again at something that was once Laughed at.
A: Haha, see this old photo Jack?

J: *Relaughs* haha yes Andrew, I'm Relaughing at that old photo of Us as Kids.
by Flabbergastic Annihilation. September 01, 2011