smackuum Share definition Flag verb. The process of physically beating someone, then eventually sucking up to them so they do not hate you forever and ever. Disgruntled girlfriend: My boyfriend is being such a prickFriend: Just give him some smackuum! smackuum by Ryyyyyyyy June 22, 2009 0 0 Get merch Get the smackuum mug. Buy Now — $32.95 See more merch