Learn the meaning of guy as a noun for a man, a group of people, or a rope. See how to use guy in sentences and phrases with examples from the Cambridge English Corpus. REMASTERED IN HD!!Official Music Video for Let's Chill performed by Guy.#LetsChill #Guy #Remastered Guy definition: a man or boy; fellow.. See examples of GUY used in a sentence. Hey, guy, give a man a break, would ya? (colloquial) Thing, item (term that can be used to refer to any entity) This guy, here, controls the current, and this guy, here, measures the voltage. This guy is the partial derivative of that guy with respect to x.