Polynesian Handshake Share definition Flag The sexual act of shitting into your own hand and then giving someone a handjob. I once knew this guy that wouldn't jack off unless it was a Polynesian handshake... Polynesian Handshake by Rory September 3, 2007 0 0 Get merch Get the Polynesian Handshake mug. Buy Now — $32.95 See more merch