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1.
Large amps at a party, that people climb up on and start dancing, while the beat and music pump out of the speakers beneath them. Usually a fun, but slutty attention seeking practice aimed to pump up the crowd by shouting the lyrics at them, preferably done after drinking quite a bit of alcohol.
Girl/Guy: I love this song! I'm getting up on the Slut Boxes so everyone can see my moves.
Friend: Wanna see how many people we can get on it?
by Minty91 October 18, 2010
 
2.
Slang term used to identify any female of any age, but more specifically applied to the girlfriend of one of your friends. Mostly used in greeting or when plans go awry due to said slutbox.
"Hey, are you going out with that slutbox tonight?"

"We were going to go miniature golfing but his slutbox put the kaibosh on it."

"How's your slutbox?"
by Fellas March 31, 2005
 
3.
A super slut.
Halle Berry used to be a slut box in high school
by A P March 28, 2004