As said by J-Roc on "Trailer Park Boys", a mafucka is the urban bastardization of motherfucker (q.v.) however its use can vary widely, see example:
"Game's postponed because no mafuckas can go to Canadian Mafucka and get a new orange mafucka for $2.99 !?"
by J-to-the-R-O-C August 07, 2005
2 more definitions
The pimp way to day motherfucker
I'm finna get in this mafucka ass
by duse February 28, 2005
Derived from the rapper Jroc from the Canadian tv show Trailer park boys, just another way of sayin Mother Fucker, just with a twist
Yo that ma fucka over there is suckin his teeth at me.
by DylanDouglas March 11, 2010