Used to describe a handjob technique in which the female lacks knowledge and believes that manhandling your penis will result in pleasure.
She had no idea what she was doing, she was jerkin me off so hard last night, I thought I was cumming blood.
by Fred Riahi May 3, 2006
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Originally a song by Cannibal Corpse, it has also become what is known as one of the most annoying memes ever on UG (Ultimate-Guitar) in the message forums.
Person A: Hey Pit, whats a good song to learn how to play on guitar for my girlfriend?

Person B: I Cum Blood
by sweatingbullets January 13, 2009
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