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Mutha'uckas 

According to folk-comedy duo Flight of the Conchords, Mutha'uckas are people who " 'uck with your shi-", such as a racist fruit vendor, or people who work at the bank.

it can also be a thing, such as "mutha uckin rent"
1) I pay my mutha'uckin' rent fortnightly
Mutha'uckas at the bank trying to play me

2) The mutha'ucka runs a racist 'uckin' grocery
The mutha'ucka won't sell an apple to a Kiwi
Related Words
Referred from 'Big Shaq' - When he was relevant - in one verse to define one's girl as a prostitute.

If one simply still refers to this phrase, then one's a bellend.
See your gurl in da park, dat gurl is an uckas

uck ass neck 

you dirty, no good uck ass neck
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