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.

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

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.

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

a drug that can seriously mess you up. some say it comes from the eggs shells of turtles from madagacar so that's why it's so hard to get, but others claim it's made by heating up a very rare certain type of fungus, one that when it is heated, takes a form similar to that of the shell of a turtle. taking one turtle shell can greatly increase dopamine uptake in the brain and send the user on an unbelievable trip. there are no known addictive properties, however there can be damaging long-term effects to the brain and CNS.

There is nothing to describe about this drug, because many people do not survive the trip, but for the ones who do, they say it is the craziest shit theyve ever done. Don't even try to find the drug because it is only found on 3 beaches in madagascar where leatherback turtles lay their eggs exposed to sunlight, which is what makes the drug so powerful.

When your balls shrivel up into your abdomen, leaving the scrotum looking like a ridge-textured turtle shell. This is commonly caused by either exposure to cold or in those situations that give you the willies, much like goosebumps.