Haha Syndrome
A disease where a girl, usually a teenage girl, adds haha to everything she types online, even when it's not funny. It's like she's trying to make the whole internet laugh, even if it's just her and her best friend.
Haha I'm eating pizza. Haha my dog is cute. Haha I'm bored. Haha.
Haha I failed math. Haha my hair is bad. Haha I'm still typing.
Haha I'm going to sleep. Haha I'm tired. Haha I'm done.