Ahahers

Used as a pose of extended 'ahaha's'

Daniel: "Cindy, did you hear? Brazil lost 7-1 in the World Cup '14"
Cindy: "Ahahers!! Nooo way!"

ahah

haha spelled backwards

Person 1: My best friend got hit by a truck and is now on life support :'(

Person 2: ahah

AHAH

Laughing like a bitch

Julia: Hey, I bought the new sketchers last week.
Josh: AHAHAHHAHAHAHAHAHAHAHA REALLY?

aHaH

The lyric from that song “imagine”.

“Can you imagine?”
*insert high note here (aHaH)*

ahahs

the plural of ahah

ahahs! so funny

Ahah

"ahah" or "ahaha" and other deviations is the inverse of "haha" and has currently no univeraally agreed upon definition.

Until consensus, it can, for example, be meant as:
(1) sarcastic or fake laughter.
(2) embarrassed laughter.

Or just be a typo.

(1) "ahah you're so funny!" or "yeah ahaha totally..."
(2) "I don't actually know how to cook ahah."