The hair that gets caught from boxer shorts or panties in the butt crack or around the vag and get's caught in the pubic hair resulting in the term, cleg hair.
Ed “boom boom” Jarvis had worked successfully in the adult filmindustry for years, until an extreme case of cleg nuts befell him at the early age of 42, doctors surmised the cleg nut effect can be accelerated due to extreme over use
A Nutty Clegg is a cling on. A Nutty Clegg is where you don't wipe your arse after doing a shit and the poo dries up and sticks to Your arse hairs and can sometimes make you feel very uncomfortable. It is very painful to remove Nutty Cleggs.