suckmouth Share definition Flag 1.to fail at life 2.a person who is constantly giving head. 3.am endearing term for a loved one. my girl is such a suckmouth, it's awesome. mom, your such a suckmouth. suckmouth by pedro the beaner July 12, 2011 0 0 Get merch Get the suckmouth mug. Buy Now — $32.95 See more merch