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1.
A unit for expressing the intensity of sound. Also known as 'dB'
My subwoofer is at 2.12 decibels out of a possible 30.00 decibels, and still the neighbors are complaining.
by nyiddle January 05, 2006
 
2.
A measurement of one's gait.
(Baker and Gabby walk like they are on a mission, while Emily lags behind) "Emily, why are you walking so slow?" "What are you talking about, I'm walking at a normal decibel, you guys are the ones walking wicked fast."
by smeagly December 29, 2011
 
3.
When someone is getting loud, sassy or mouthy.
Somone raises their voice at you and you respond:

"Hey, you better check your decibels!"
by psufreak October 06, 2009