A male who lives with his girlfriend without paying rent.
Rent and bills are paid by the girlfriend, the cocklodger relies on the fact that the couple are shagging to continue his residency.
Yeah, that guyJim doesn't pay Rebecca rent to live in her flat, he's a cocklodger.
Derives from the Silent Bob character and popularised by the rusty joystick forums troll called neomonk. Has a growing popularity to mean someone who trolls forums for the purpose of upsetting and annoying people. Also prone to pseudo intellectual comments and a self obsession with own opinions
Neomonk stop behaving like such a cocknocker - its not big, its not hard (rather like your genitals really)