Turtle shell

The really annoying things in mario kart that fuck you up really bad. They come in three different types:green, red(or brown), or blue. The green ones aren't so bad they just fling around stupidly. The brown ones, you should watch out for.
They seek the person in front of you and fuck them up. The blue ones automattically go to the player in 1st place.

When you sit down and your balls are showing through your pants.

Psilocybe tyrannus, or commonly referred to as turtle shells, is a fairly new discovered psychadelic drug that dramatically increases a person's uptake of dopamine when consumed. Not only that, but it also contains high amounts of dopamine. The drug is actually a rare fungus that has nothing to do with a turtle. The fungus comes from several island countries such as Madagascar and the phillipines, and needs to be grown in intense sunglight. Even after it is full grown, the dealer must heat the fungus at high temperatures to make it produce pyschadelic effects. The result of this makes it almost leathery, and people say it looks like a turtle shell hence the name. Other street names include the tyrant, sithlord, dooku, and darth turtle. The trips of this drug have been compared to that of acid and ectasy but even stronger. Although there is no physical addiction to this drug, long term effects can be devastating to one's brain cell count and create a future of mental illness.

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.

In Call of Duty: MW2, when someone puts a Riot Shield on their back and goes prone so they can not be knifed.

When you masterbate so much you develop a calis on the head of your penis and then don't shower for a while and go and bone.

the muscles on a toned or muscular persons body where their abnominals meet the top of their thighs, creating the look of a turtle shell