Top Definition
The occasion of the release of a technology/website to the general public that was once invitation only.
I don't have any numbers in my gmail address, I joined before the proleout.
by MattAtHazmat November 29, 2013

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×