1.a guy who is primarily interested in romancing other people's girl friends.
2.used in the trucking industry - especially on the CB radio as truckers talk to each other. The term 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.
"the baddest group of alcoholic, red neck, git box slingin take no shit and hold no prisoners, johnny rebel, bourbon and whiskey drinkin, old school (real) country musicians around. im the new drummer "
~Justin's reaction after a practice