What does Kiestering mean?

Kiestering meaning in Urban Dictionary

In prison, kiestering smuggling in ass frequently accounts for a tiny part of the contraband. Most inmates only kiester one thing if they're coming through Visiting or from beyond your prison. After they tend to be inside they don't really have to worry as much about being strip searched because they are usually only provided a pat-down so that the need to kiester is less essential.