|1.||Haha, that's funny|
Used in real life conversations or IM meaning, "I'm pretending that's funny, but it's really not" or, "I have not idea/I don't care what you just said, so I'm gonna say this." Also sometimes used with lack of enthusiasm in real life to show sarcasm.
Similar to lol, lolocaust, and haha.
Frank: I just threw an apple at my sister! LOL!
Donnie: Haha, that's funny.
Meaning: What the fuck, you suck at humour.
Joe: So, I said, "No, that's my seat, yours is over there."
Jake: Haha, that's funny.
Meaning: I'm bored, I'm gonna go get high.