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
1) Ha is a squawk used by hawks in their language. Typically the black raven hawk type uses ha as the base of their communication form. Ha is the bases of their language form and when speaking in hawk language ha is communicated via the depth and duration of the ha.
2) Ha is also the Chinese work of down, in Cantonese. In Cantonese the lower is the most universal accepted and mother father father mother symbiosis of the relationship. Some use hahaha as a revelation of such simplicity where the obvious was not able to be prior explained and thus hahaha is use to express such a new found revelation.
Typically used whilst describing a happy feeling, originates from the swedish governerEdith Burgerson, who in a notoriously speech said "Internet is just a temporary virtue, hahaha".