heyguy Share definition Flag Someone who you don't know, but see frequently enough that you say "hey" to each other every time you pass. Guy 1: Hey. Guy 2: Hey. Friend of Guy 1: Who was that? Guy 1: Just my heyguy. heyguy by Douglas Young September 22, 2007 0 0 Get merch Get the heyguy mug. Buy Now — $32.95 See more merch