The art of hiding an erection while sitting and leaning one's upper torso at a 45 degree angle betwixt one's chest and lap. The owner of said erection then proceeds to arch their back in such a way that makes them appear to be sitting upright. This causes said erection to recede into the body causing a "turtle shell" effect.
by JoPaGeRi.TBC September 11, 2007

by Erik Knox May 30, 2007

During sex, when a person is about finish first, their partner punches them in the face or back of the head, thus allowing the trailing person to finish first.
by Hockeycapn July 29, 2017

When it’s cold or not and your dick decides to back inside yourself like a turtles head goes back in it’s shell.
Gawd damn! My dick gawn back in his turtle shell! What’s wrong lil guy? Ya cold? Come on out, I’ll keep ya warm in my hand.
by Dr.EvilRaj July 27, 2018

by Nub Nublet October 30, 2020

Men who ride Harley's or other cruising type bikes, who wear turtle shell style helmets because they are not driving fast enough to need a full helmet usually. And they ride on a bike that has had custom steering handles installed. The handle bars are usually raised an additional 10 to 12 inches, making the rider appear to be hanging from a monkey bar.
"How bout that turtle shell on a monkey bar, his tiny helmet had huge skulls painted on it and he was barely able to hang onto his monkey bar because it was almost too high..."
by BOSS*bitch June 11, 2015

A person who looks like a literal turtle without a shell and/or sucks. Used as a term for someone who is a butt sucking turtle without a shell.
by no one freaking cares February 23, 2022
