What does it mean if i girl starts calling you "Cheezeit"?
It is probably an inside joke with you... or her friends, or she thinks you smell like cheezeits.
Just a cute way of teasing you to make you laugh.
She thinks you're a snack? Not a meal ?
Haha it's just for fun. It probably doesn't mean anything bad, it's just a nickname. But think of one for her :)