A dude who don't much like females. But preffers knocking his cock or balls against another dudes asshole. When he's shafting him
"sunny's a right fucking cock knocker. I don't think he'd know what to do, even if pussy was offered to him on a plate"
by Rajobajo April 12, 2016

A quick strike to the top of the head with the hand. The clobber-knocker is applied by clenching the fist and swinging down on top of the head, using only the flat part of the fingers between the first and second knuckles. It is a very practical form of a sucker punch.
by Matt October 31, 2004

A young child who breaks a 'rule' yet, because they are so adorable, huggable and "scrumptious", they manage to get off the hook with a simple reminder to "not do that again". Sound familiar????? :)
Joanna! You spilled the cereal all over the floor again! You little toot-knocker!!! Come to mama you precious pumpkin!
by 26.2 mile mom April 25, 2009

Oh My God! Did you hear about that hob knocker and what he did in the bathroom last week at school!?
by Madzyy Shaww<3 June 29, 2009

When someone woke up on the wrong side of the bed and chooses to take it out on you or people around you.
Kyle: Oui, did you hear about Mrs.M?
Chase: No, what happened with her
Kyle: Apparently she was being a real knocker
Chase: No, what happened with her
Kyle: Apparently she was being a real knocker
by High school Pimp January 18, 2022

A male or female attempting to gain access to a female's pussy without prevail. Much like a fuck boy.
by InventorMan69 May 10, 2016

A knocker-upper was someone whose sole purpose was to wake people up during a time when alarm clocks were expensive and not very reliable.
"M. Smith earned 6 pence a week as a knocker-upper using a pea shooter to shoot dried peas at the windows of sleeping workers in East London, 1930s"
by ethic. January 4, 2021
