Construction slang for a sheet metal worker. A trade far superior to pipe fitting. Only union sheet metal workers can be called this, non union workers are just called dirty rat scab bastards. The only true craftsmen on the job who make what they install... duct work. They are also sick individuals with a twisted world perspective. Also huge dicks. You can see them from space.
That damn tin knocker ran my apprentice off AND shit in my lunch bucket!
by Fordicater December 06, 2011
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Or often called "double noggin knocker", is a combat move used to take out two assailants simultaneously. Not to be confused with a headbutt... this move is performed by taking the heads of two opponents and cracking them together, with little impact upon oneself.

You see this kind of thing alot in tag team style professional wrestling.

This move seems less effective against pacific islanders, as apparently, their heads are harder than most people's.
Bushwacker Bob made a big mistake when he tried performing a double noggin knocker on the Samoan brothers.
by Alfie The Horndog June 18, 2007
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This is a word used by construction workers as shorthand for a sheet metal worker
For example, the tin knockers installed the ventilation system in the new women's shelter.
by Ronny J. February 14, 2008
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The drinking of alcohol via a shot glass placed between a woman's cleavage.
On TV show, Wilfred.

"Who wants a knocker shot?"
(woman walks over and places shot of jager between her breasts)
"Okay..."
(Elijah Wood then drinks the shot between the waitress' breasts)
by darksteel July 19, 2013
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A fart so powerful its flatulence makes your testicles flutter.
My balls just flew over my shoulder after that nut knocker.
by Pinky 2 Totters January 15, 2007
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A slang term for military college or university graduates. It refers to the large graduation rings that are usually worn by said persons, and to the tradition of knocking the ring on a table to quiet a boisterous room.
Carl just graduated and got commissioned... and now he's SUCH a ring knocker.
by K...! May 03, 2006
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