An easy word to get someone else to shut up
Me: Mwah, Now shut up you really bug me
Mwah hahaha hahaha
you are sooo jealous
Also used as an evil laugh, short for mwahaha.
Person: Hi, wanna go buy some cake?
Other person: Mwah, i'm broke.
Person: *falls down the stairs*
Other person: Mwah! xD