shrimpin Share definition Flag The term used when describing gay foreplay when one man ejaculates inside another mans rectum, and then sips it with a straw. After Marcus came into Zacks ass he went shrimpin and drank it out with a straw. shrimpin by Ben Dover November 8, 2004 0 0 Get merch Get the shrimpin mug. Buy Now — $32.95 See more merch