It's simply a calque from English - "motherfucker". It is not popular (if at all existing) in Polish dictionaries. Common translation of "motherfucker" in Polish is:
"skurwysyn" or "sukinsyn".
Matkojebca i wujkojebca to dobre przyklady slangu w stylu serialu South Park.
Matkojebca is a polish word, similar to the motherfucker in english. Isn't very popular, but exists.
Wypierdalaj zjebany matkojebco.
Ale z niego matkojebca.
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