The under cuck 

When a cuckold (male spouse) is laying flat underneath his wife or spouse (usually in a 69 position) while she is getting rammed by a bull (other male)

Me and the misses just tried the under cuck the other night and the view was fantastic!

The under cuck by TheCuriousCaseOfAids March 3, 2016

The under cuck suprise 

Similar to The under cuck but with a creamy ending.

I was doing the under cuck with my wife when suddenly the man spunked into my wife! Guess I ordered the under cuck suprise !

The under cuck suprise by TheCuriousCaseOfAids March 3, 2016

The Under Toe 

The she-male cleft, reffering to its gravitational pull, thus sucking you in.

I tried to come up for air but the undertoe had pulled me back down.

I'm suffocating in the Under toe.

Damn bitch, yr under toe is outta control!

I was attracted to your under toe like a fly to a bug zapper

The Under Toe by Twat Knocker's annonymous January 31, 2006

The Under and Out 

A cool new hairstyle that is all the rage in which both the left and right halves of one's hair flip out in the same direction. A small segment of the population are lucky enough to be born with hair that is naturally inclined to position itself in such a sexy and trendsetting way, while others must spend hours standing perpendicular to a fan to create the look.

"Wow, that girl over there has an Under and Out - if only I was cool enough to pull off that hairstyle."

Or

"I went to my stylist yesterday and asked for the Under and Out - she said she hadn't heard of it and I said she should have her style licence revoked!"

The Under and Out by Ryry 2.0 November 18, 2006

The under up to do

The act of dancing on a table

I just can’t even deal with Greg’s the under up to do

The under up to do by secretive sexual guru March 9, 2020

over the under 

A perseverance over something unpleasant.

"To us, the title Over The Under means we’re over all the negative stuff, we want to move forward."
-- Kirk Windenstein

over the under by Valamarth May 17, 2009

The Crab Under the Bridge 

Verb: The act of performing a spit roast while a male takes the crab position beneath the female, with head placed between the penetrating male's legs while receiving a tit wank from the females low hanging breasts. This person may or may not lick the balls of the penetrating man.

Guy 1: "Yo CB3 was the Crab Under the Bridge and started tounging my balls."
Guy 2: "I'll have to try that sometime with Loz and Haz."

The Crab Under the Bridge by Zeek-McBreadsticks November 7, 2014