A Person Who Changes Uniforms During Wartime To Appear As If They Are On Your Side. Could Also Be Someone Who's Not Really Your Friend But Are Only Trying To get Information For Your Enemy.
Co-Worker: Watch What You Say In Front Of Him. Because I Think It Gets Right Back To The Bosses Ears.
To sponge, mooch, free load, skate by, or do absolutely nothing but watch while somebody else does all the work and still somehow try to take at least partial credit for something you had no hand in. The act most likely originated back in Tallahassee in Apt# D9 and then fully cultivated to a personality trait on Calcutta Street.
Anticipating good times to be had for all, Kevin put down the Nintendo and was observed "Riding Coat Tail" all the way to Michelangelo's.