According to the FX version of Pineapple Express, the polite and censored alternative to saying Motha Fucka.
Matheson: You want to wear my vest? It smell good.
Budlofsky: No thanks, not my style.
Matheson: Style? You ain't got no style, "mucka lucka".
Guy 1: *playing Halo Reach* Take that mucka lucka!
Guy 2: Did you mean to say motha fucka?
Guy 1: No
Guy 2: Oh