What is Ke Ke?
1.
A representation of laughter sometimes attributed to people of Asian origin. Sometimes includes more ke's.
kekekekekeke omg zergrush (credit to SomethingAwful Comedy Goldmine for this example)
2.
the sound attributed to gossipy & gleeful whispering and giggling between two or more parties. It can sometimes be directed at girlish gay men who are engaging in malicious gossip.
you two little bitches can ke ke if you want to, but I'm gonna squeeze my big fat ass in these skinny jeans even if it kills me.
See
3.
A form of laughing, similar to ernie's laugh on sesame street