Top Definition
To reboot Windows 7 Beta or RC before the 2 hour time limit automatically reboots your computer.
Hold up a second, I gotta preboot. BRB
by markwo March 07, 2010
A portmanteau of "prequel" and "reboot", a preboot is a film in a series that takes place before its predecessor(s), but also tries to rewrite the history of the series as well.
X-Men: First Class is widely considered one of the best preboots in modern cinematic history. It's an origin-of-the-X-Men story that fixes the flaws found in previous X-Men movies.
by LovedX4 June 14, 2011

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