Also used to describe people who load up machines to make themselves seem strong. but in reality are just weak and making a fool of themselves
Me "Hahaha yeah, he's got more swing happening than a major league baseballer. What a one rep champion!"
Mate "look at Herp, he loaded up 150kg's on bench"
Me "...........yeah but if his spotter wasn't there he wouldn't be able to do half of that weight"
Mate " Look at him, whatta head!"
Me "ONE REP CHAMPION"