Cock marking 

To tattoo a mark across your pecker every time you fuck a new woman in order to keep track of them.

He's into cock marking.

Cock marking by Jedge dredd7 June 6, 2011

Cockmarking

The act of cockblocking, but exclusively referring to cockblocking done by individuals named Mark. Not to be confused with Markblocking.

Was out for a night on the town with a lady friend but my buddy kept on cockmarking me. That unaware bastard never takes a hint!

Cockmarking by yoloswag420blzit February 27, 2014