Blum is the mixture of Blood and semen to form a balance of 75% blood and 25% semen. When in this form it is known as Blum. This mixture originated as the left river of the two separated by the snake.
by Zman110 August 16, 2011
A nickname for a bad-ass person who works on classic cars & motorcycles. (also rad upholstery for any vehicle) It's quite possible for a Blum to show up on TV, Velocity Channel.
by donttellmehow February 26, 2013
When you're girlfriend is on her period and on the pill and you just don't give a fuck but don't have a condom and have sex with her anyways. the resulting mix after you get off is known as blum a mixture of blood and cum.
by beau gosse May 29, 2011