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
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Beating Off A Dead Horse • beating off • Beating off behind the bush • beating off the clock • beating off the dog • Beating off with camp soap • SYNONYMS: chokin' the chicken, spanking the monkey, flogging the dolphin, beating off, jackin' off, buffing the banana, wanking off, playing with yourself, tootin' your horn, fighting the purple helmet warrior, rubbing the one-eyed snake, commiting spermi • beaking off • Beasting Off • Beatzing off