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1.
Trucker slang for a police helicopter.

See smokey bear.
"Yeah, them smokies is thick as bugs on a bumper;
They even had a bear in the air!" - Convoy, C.W. McCall
by Bandit32 September 11, 2006
 
2.
A term or saying for a fart.
Whoops, sorry guys, there's a bear in the air
by JasperTour July 28, 2011