Red Knot 

The tender state of your mate's balloon knot after a pleasurable evening of anal plundering his or her pucker spot.

Barry left Carla with a quivering red knot after pounding her booty hole.

Roger realized he was getting sloppy seconds when the guy he picked up already had a red knot going.

Red Knot by Eaton Holgoode February 15, 2017

red knot 

When two long dick dudes tie them together and then try to pull the knot out until it becomes a bloody mess. Red knot!

I walked in on my roommate yesterday and he and his boyfriend had their dicks tied together and were pulling apart, it was a bloody mess!! It looked like a Red Knot!!

red knot by booker t washington October 17, 2015