People who won't stop bragging about their involvement in torture races, i.e. Tough Mudder, Spartan Run, etc.
"Here comes Steve wearing a new race shirt he's going to tell us all about, what a mudder fucker."
7👍 5👎
One who completes the Tough Mudder Challenge.
Guy1: Did you hear Michael completed the Tough Mudder Challenge?
Guy2: Yeah he's a Tough Mudder Fucker.
6👍 8👎