Tip-Zip 

The act of zipping your pants up in a hurry and accidentaly catching the tip of your penis in the teeth.
Made famous by PC Productions, an underground film group.

Trying to get out of the bathroom in a hurry, I experienced a tip-zip, it hurt like a bitch.

Tip-Zip by Clint Davis January 2, 2006

Tangy zip from the tip 

To urinate in someone's mouth

My wife refused sex so while she was sleeping she got the tangy zip from the tip

Tangy zip from the tip by Dedwards79 December 29, 2017

Zipped The Tip 

Zipping the zipper abruptly causing the zipper to nip the tip of the head of the penis. Also known as a bathroom circumcision or bedroom circumcision. Verb: Zip the tip.

While masterbating, Aaron's mother walked in and he tried to quickly cover up. Unfortunately; he accidentally zipped the tip, then his mother asked why he was crying.

Zipped The Tip by littler0 January 13, 2009