Arachni puss Share definition Flag A very hairy vagina, that may resemble a big black hairy spider. i.e 'Damn, thats the last time im going down on that chick, because of her arachni puss im still coughing up fur balls. Arachni puss by elbby one August 14, 2009 0 0 Get merch Get the Arachni puss mug. Buy Now — $32.95 See more merch