To set up an escape route for an upcoming event or function that you're not sure if you'd like to attend, but don't want to rule out completely.
I had to pre bail on my grandma's birthday party and told my mom I had a headache in case I can score a ticket to see Death Cab.
by Corrie Nichols August 28, 2006
a sum of money given to a cop at the moment of arrest in exchange for a pardon.
"All I had was 1 dollar worth of prebail. I never had a chance convincing that cop to let me go."
by heythewhat January 17, 2012