What is sounding urban dictionary?

Sounding is a sexual practice where a person inserts a smooth, slender object (such as a metal or glass rod) into their urethra for the purpose of sexual pleasure or stimulation. This practice is not recommended as it can cause serious injury and lead to infections. The term "sounding" is often used as slang for this practice in the context of BDSM or other sexual activities. The term can be found in the Urban Dictionary, which is an online platform that features user-submitted definitions of slang terms and phrases.