SICK! Share definition Flag Said when you have no idea what others are talking about but feel the need to be a part of the conversation. May often lead to an Adeebify. Ashkon: Hatam's is so gross. Shawyun: Yeah I know! Adeeb: Sick! (Adeeb does not know about Hatam's) SICK! by Shashkon1 January 25, 2007 0 0 Get merch Get the SICK! mug. Buy Now — $32.95 See more merch