During a threesome, when two penis's are twisted and then penetrate the anal cavity, without any sort of lubrication. Thus making the receiver thrust their bodies in a forward motion, like a galloping horse/unicorn.
"Yo Liliya, do you want to go round 2 again tonight on the twisted Unicorn? I was talking to Luke and he said he loved the idea of making you gallop."
by wheelingchow November 13, 2016