Commonly used in the regime of an evil dictator by the name of 'Coach' and his/her faithful servant, 'coxswain'.
Originally derived from the greek word meaning "to work," which is what one does; very, very hard, for a long, long time. Causing the buildup of extreme amounts of lactic acid in the body, and thus great pain.
God, I hate the erg, please kill it.
Marcelo is soft, a girl beat him on a 2k on the erg.
Rick: hey Fred, why dont you shut the fuck up before i punch you in your head!
Me: *gun to the head*