An abbreviation of "meneh heh." Originated as a sound used by Southpark's Cartman. Now found in and around the Chicagoland area as a response to a "so so" idea or plan. Can also be used as a greeting or filler comment when the situation is blah.
(skinny girls conversing)
Elif: "you want to go eat a burger?"
Elif: "Meneh heh"