to show disapproval of a subject in a condescending fashion, often signaled by a roll of the eyes or sour face expression.
by J Fair June 17, 2004
Get the boo thatmug. To be the victim of a significantly heinous act, usually under the influence of alcohol, much like that of Robert Tellez. To be Booed can be a victim of actions such as flashing, sack tapping, sexual intercourse, peer pressured alcohol intoxication, diarrhea, and hospital injuries. To many people in california, it is an honor to be Booed.
Dude, I got Booed really hard yesterday night. I was flashed the goat when I was eating my Wendys. I puked everywhere when I saw it and also cause I got booed by drinking too much!
by Sinishad June 18, 2011
Get the Booedmug. A Boo is a type of ghost featured in Mario video games. Boos made their first appearance under the name of "Boo Diddly"(a play on Bo Diddley an early R&Bguitarist) in Super Mario Bros. 3 and was virtually invincible to all attacks with the exception of the Starman and the Hammer Bros. Suit.
by TheBlackMew September 7, 2006
Get the Boomug. by this is rap ill m itch April 11, 2003
Get the boomug. 
1: An affectionate name for someone you love.
2: Something that a ghost says.
3: The short version of my cat's name, Boo-Boo.
2: Something that a ghost says.
3: The short version of my cat's name, Boo-Boo.
by Loki August 24, 2003
Get the boomug. Word used when expressing your disdain when somebody changes their mind about something, i.e. after something improves and is worthy of their notice.
You didn't say boo to the White Sox until they won the world series.
That guy never said boo to you until you lost all that weight.
That guy never said boo to you until you lost all that weight.
by Paddlegurl December 28, 2005
Get the boomug.