To continue trying to beat off a horse when it clearly isn't going to work anymore due to lack of blood flow.
Dude: I was out beating off a dead horse last night, but may hand started to cramp up, so i just went home instead.
by XxVRxX August 20, 2010
Random phrase invented to let people know you're getting off of the couch or other similar sitting object.
by XXVRXX October 12, 2010