ha ha

also ha ha ha

1) EXCLAM Ha ha or ha ha ha is used in writing to represent the sound that people make when they laugh.

I dropped my bag at the officer's feet. The bank notes fell out. `Ha ha ha!' he laughed. `Got no money, uh?'

2) EXCLAM People sometimes say `ha ha' to show that they are not amused by what you have said, or do not believe it. [SPOKEN]

He said 'vegetarians unite', and I looked at him and said 'yeah, ha ha'.