What is Hahaha?
1.
To express on AIM when something was funny, because just 'haha' isn't that dramatic and can be used as just aknowledging when someone has said something.
Bobby31: ...they call it cheese and quackers!
Annette85: haha
Bobby31: oh come on it was funnier than that
Annette85: hahaha
See
2.
A taunt to used by the enemy, usually after they set up us the bomb
You have no chance to survive make your time. Hahaha.
See
3.
when someone laughs too much!
`hahaha'
`woah, calm down mate, it wan't that funny!'