(noun) a guy who is primarily interested in romancing other people's girl friends. Immortalized in the 1950s by the Everley Brothers in a song of the same name.

used in the trucking industry - especially on the CB radio as truckers talk to each other.
A bird dog can be noun which means a radar detecter.
Or can be a verb which means a law enforcement officer is paying particular attention to a trucker

A.) (v.) To stare at the opposite sex in an obvious manner, such as a bird dog, like a Pointer, would do when the hunter has shot a bird.
B.) (v.) To stare while shading your eyes from the sun with your hand.
C.) (n.) A dog that hunts birds.

To watch someone closely while making no attempt to hide that you are doing so.

A small, but fair amount of money commissioned by the seller of product or services for introduction of a buyer.

1. When a supervisor sneeks up behind you to check on you.

n. An automobile that is going fast enough to "flush out" police and allows another automobile to drive over the speed limit without being ticketed.

Synonamous with cop cleaner.