Turtle tuck 

When you tuck your penis inside itself

A turtle tuck is necessary in cross dressing.

Turtle tuck by Dinosaur Boot March 7, 2016

TurtleDuck 

The animal species classification for the Koopa Troopa enemies found in Nintendo's Mario Brothers games.

It's the worst when you die at the hands at one of those generally useless jumping turtleducks in SuperMario Bros.

TurtleDuck by deefab430 January 25, 2010

turtlefuck

A fuck done in the style of a turtle. Meaning in a shell.
A turtlefuck is a little-known sex position that is slightly more complicated than most. It requires that both participants wear turtleshells large enough to place themselves in (this usually means a fake or synthetic turleshell). The actually sex must be done almost doggystyle but with the shells on, and VERY slowly. This cannot be stressed enough as any rapid movement in the turtlefuck will make it unsuccessful. And green paint may be needed in some very VERY special circumstances. Also, there must be a song about turtles, a cartoon featuring turtles, or a large poster with a turtle on it. Or, in ideal situations for a turtlefuck, there may be as many as 500 live turtles in the immediate vicinity of the turtlefuck(s).
A common misconception about the turtlefuck is that it does not alter the birth of children. A good example is how most people believe the Teenage Ninja Turtles to be the result of some crazy radioactive shit and turtles. The truth of the matter is that the Teenage Ninja Turtles are the result of a highly successfull turltefuck between Chuck Norris and Wonderwoman.
Turtlefuck is also sometimes a term used to a person. see the example 1.

1-Dude, you are a turtlefuck.
2-He/She is down for a good ol' turtlefuck.
3-Hey baby, i got the shells, time for a TURLTEFUCK!

turtlefuck by C. Bond June 9, 2007

Turtlefuck

A slow moving disaster

My son has a doubleheader tonight. It's going to be hot and muggy and the mosquitoes are gonna be everywhere. This is going to be a turtlefuck!

Turtlefuck by St Charles Whisker Biscuit September 14, 2015

Turtlesucker 

A person, place, or thing that sucks on turtles

Wow, that guy is such a turtlesucker!

Turtlesucker by Hamburger Pizza June 26, 2016

Turtleduckin

When a hard on suddenly retreats and calls it a night ...like a turtle ducking its head back into its shell, not to be seen for the rest of the evening.

I guess willie has gone on strike because the S.O.B has PULLED a turtleduckin . Like elvis has left the building.

Turtleduckin by DR.S Moostie February 16, 2021

Turtleduck 

It’s when u have that little soft spot for someone a tiny one but don’t know how to express it so saying turtleduck will do the job for ya

My turtleduck

Turtleduck by Turtleduck April 13, 2021