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Someone who is an absolute idiot. They usually confine to one or more of the following common symptoms; having no street knowledge whatsoever, makes stupid non-sensical comments, having illogical (usually illuminati based) ideas, and completing actions based on these various principles of generic idiotic life
Daz: What was Jack thinking when he wore that full body tracksuit?

Isels: I don't know, but he's not as bad as Malcolm who thinks that McDonalds is run by the Illuminati

Daz: Christ, they're both such cretinfuck's

Isels: Hmmm, I'm not sure, Callum is much more of a cretinfuck for thinking it's ok to piss into a his sink in his room.
by Generic Man January 27, 2015
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