Top definition
That guy who is not in very good shape, yet feels the need to criticize everyone on their form and the amount of reps someone does during a specific exercise.
Guy 1: Yo dude, your curling form is horrible. Straighten your arms and increase your weight.

Guy 2: STFU Mr. Fitness Instructor. Since when did you become an expert this shit?
by BIG SCRAP November 24, 2015
Get the merch
Get the Mr. Fitness Instructor neck gaiter and mug.
Apr 22 Word of the Day
When you eat dirt for the first time and leave your family to build a shack in the woods
Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak
via giphy
by ecogoth December 30, 2020
Get the mug
Get a dirtpilled mug for your daughter Nathalie.