Bet nobody gon' run me, don’t end the permanent gumby
Gumbys are recurring characters in Monty Python’s Flying Circus, characterized by a very distinctive appearance. If a name was listed for them, the surname given would always be “Gumby”, and the first name would usually be given as two initials. A popular Gumby catchphrase is “My brain hurts!”, which was used in the “Brain Surgery” sketch.
The second half of this line should read “don’t end with a permanent Gumby.” It is a reference to the Gumby haircut which was popular in the late 80’s and early 90’s. The haircut resembled the head shape of the claymation character Gumby. Fiend is saying that if you try to run his shit, he will shoot you and leave half of your head missing, mirroring a Gumby haircut.
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