happysuck Share definition Flag A person who is negative or a killjoy. A person whose every action seems to be a buzzkill, as if they literally suck the happy out of others. Her job was a real downer because her co-workers were all happysucks. happysuck by Leastie July 28, 2013 0 0 Get merch Get the happysuck mug. Buy Now — $32.95 See more merch