hahaha
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.
Example:
Bobby31: ...they call it cheese and quackers!
Annette85: haha
Bobby31: oh come on it was funnier than that
Annette85: hahaha
Bobby31: ...they call it cheese and quackers!
Annette85: haha
Bobby31: oh come on it was funnier than that
Annette85: hahaha