serotonin sucker Share definition Flag Someone who is so miserable they bring you down and sap your happiness. Everytime I'm with that serotonin sucker brother of mine, I feel gloomy. serotonin sucker by Jonfurstn November 25, 2009 0 0 Get merch Get the serotonin sucker mug. Buy Now — $32.95 See more merch
