When a person becomes a member of a certain gang they must kill a designated person in order to join said gang (blood in) and the only way out of the gang is to die (blood out)
by Al Johnson September 12, 2006
A therm related to gang culture.
Blood in . To get into a gang, you got to spill some blood, usually murder.
Blood out - The gang is for life. The only way to get out is to die.
Blood in . To get into a gang, you got to spill some blood, usually murder.
Blood out - The gang is for life. The only way to get out is to die.
-Man, Don't mess with those guys, they're blood in, blood out.
by Amys April 5, 2006