whylin Share definition Flag to be crazy or the act of going crazy. it can also mean whatever the hell you want it to mean if a guy comes to school wearing a chicken suit, he's whylin. -dnice "that bitch is whylin" whylin by cdbrutha November 26, 2006 0 0 Get merch Get the whylin mug. Buy Now — $32.95 See more merch