Dumfker 

A dumb fucker

He is uch a Dumfker

Dumfker by Dodgey deano December 10, 2018

dumfkr 

A person who likes to get RAILED and has a negative IQ.

John was a dumfkr for stealing my shit.

dumfkr by pogi1100 November 27, 2012

dumfer 

1. a person you hate

2. an idiot/fucker

"Hey, look at that guy. did you fight him?"
"yeah he's such a dumfer."

dumfer by jamess17 May 1, 2014