Definitions by Miles at the Matinee

Mmmm eyy 

An annoying way of saying yes, has a Hispanic background. This is severely annoying, and is usually done with a Mexican accent.
the second part is pronounced like "hey" without the "H"

Marisela: Hey Sydney do you like syrup?

Sydney: Mmmm eyy.

Marisela: You asshole!

Mmmm eyy by Miles at the Matinee February 28, 2010