A whorish man known to hump the neighborhood chicks, pigs, and felines. The spreader of fleas. Occasionally found tied to his pole or in the dog house. 2.) An informant, traitor. One who betrays fellow criminals, like that of a stool pigeon. 3.) A regional term of address to a dude on the street. "What's up dog?" 4.) Your roll dog, homie and wingman. This guy will have your back, drink you under the table and laugh at your troubles just to make you feel better.