1. Someone who was in the wrong place at the wrong time.
2. Members (currently 12) of a popular group blog of the same name.
1. The evil-doers drove a car through a crowd of <i>innocent bystanders</i>.

2. Innocent Bystanders welcomes all races, creeds and orientations to comment.
by Retired Geezer May 31, 2006
The act of sitting on one's hand for 20 minutes to make it go numb, and proceeding to jerk off someone else with that hand. Very similar to the "stranger".
My girlfriend prefers the innocent bystander treatment during foreplay, but I couldn't get my hand to fall asleep
by TheDonGregga December 15, 2016
There's no such thing as an innocent bystander in real life. People are not animals, and are therefore not innocent in the true sense of the word. Every person thought to be a bystander has done something wrong in their life, and many if not most of them are usually not standing by in a passive manner most of the time, despite the bystander description some people use for them.
There is no such thing as an innocent bystander. To call someone an innocent bystander is to underestimate them.
by The Original Agahnim July 29, 2021