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1.
When a person's voice becomes increasingly louder as they consume more alcohol.
"When we were walking home from the bar last night Jeff was being a 'Denby' and waking up the neighbors."

"Hey 'Denby' keep it down I have a quiz tomorrow."
by KMike September 18, 2007
 
2.
Masturbating at school
Dude he pulled a Denby and got expelled!
by The Joker of EP May 14, 2011
 
3.
A young blonde female whos afflicted with both mental and physical distortions. Victim of much verbal abuse. OFten frequents with chinese counterparts.
Fuck about, look at that fucking denby
by Martahew March 15, 2008