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Adjective: Stupid or ignorant. Often used preceding another adjective.
"Stop acting all deery and shit!"

"Wow, you are one deery motherfucker."
by Oprinist September 13, 2009
A hypocritical, extremely lazy and sometimes dangerously stupid teacher who you can't stand.

To abruptly stop a deery teacher while they are talking to the class (or group) to voice out on how bad that teacher is.
Noun; "That teacher is such a deery."
Verb; "OMG that teacher is so annoying i just want to DEERY her while she speaks because she is so hypocritical"
by Pioneering June 27, 2014