When wanting to possess an object or being one places their genitalia on it. It is demeaning to the receiver of genitalia as normally men are the ones claiming it with their "nutsack" or "dick". so on top of having some guys nutsack on you are also their property. this is a great way to show girls that you are the alpha male in the group and clearly defines what is yours and who's its not. after someone is claimed they are under the control of the claimer. They still have the ability to claim other people and objects however.
Clay saw a hot girl in class and decided to show that he wanted her he zipped down his pants and placed his nutsack on her shoulder marking her as his property.
Brennan was upset with his step-brother Dale and to show this he rubbed his nutsack on his drumset claiming it.
Sully wanted to make sure he got the ice cream and claimed it by positioning his balls on the container.