it means like you don't have very nice skin
It is the skin of the rhino that is 5 cm thick. The skin of the rhino and hippopotamus is usually between 1.5cm and 5cm thick.
buffalo's skin is 1.562cm thick
buffalo's skin is 1.562cm thick
testicles
having skin made rough and thick through wear
It is a special skin bag called the scrotum
The skin of the scrotum, the sac that contains the testicles, normally changes color and becomes darker during puberty.
Well there are two forms of thick skin. One is figurative, such as "someone having a thick skin" and the literal, "not thin skin". Someone having "thick skin" is usually someone who doesn't allow the actions of others or their environment to affect them. This is usually achieved through living a tough life or generally having a more positive outlook on things. Thick skin in the physical sense can mean the soles of your feet, your arms, and legs. This is where skin is usually thickest. The thinnest skin is found at the wrists and ankles, groin, and eyelids.
When they are in the cold water, the thick skin heats them up.
Scrotum is the bag of skin the testicles are in.
Scrotum