undertuck n' suck Share definition Flag when a man tucks his erect penis between his legs and presents it to another person to suck from behind. i was feeling frisky so i gave the woman the old undertuck n' suck undertuck n' suck by blumpkinboychaps April 3, 2009 0 0 Get merch Get the undertuck n' suck mug. Buy Now — $32.95 See more merch
