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1.
muvva is the slang term for mother. It looks better than mutha. It's the perfect substitute for mother in any context.
ya muvvafooking retard!

ya muvva is fat.
by baluba November 20, 2005
 
2.
welsh derogatory term for a persons mother meant as an insult which usually follows a question.
1st man: wosapnin bruv

2nd man: your muvva, thats wosapnin innit bruv!
by southwalessniper November 24, 2009