Ha
Definition 1 : An (usually) Asian name, usually Vietnamese.
Definition 2 : An expression that meant something said wasn't funny, or just gave you a little chuckle. Maybe even just said to make yourself look not mean.
Def 1 : Hello, welcome to UCLA, I am your new Proffeser Ha.

Def 2 : 
Person 1 : It was like sooo funny!!
Person 2 : Ha....