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1.
Miners who have been trapped in cave-ins and pound on the rocks for rescue. It is believed that the ghosts of these miners go on knocking in the mine shafts long after the victims have died.

This definition was the basis for Stephen King's bestselling book The Tommyknockers, only in his story it was aliens that had been trapped underground instead of miners. Not a bad book.
We went out to the old mine at midnight and heard the tommyknockers tapping from far below.
by Phaedrus Raen June 26, 2006
224 89
 
2.
In Stephen King's same name novel, it refers to humans transformed into gizmo-building alien slaves.
"Give a man an anal probe, and he is good for one test. Turn a man into a tommyknocker and he can make his own anal probes."
by A kick in the pants May 17, 2005
97 71
 
3.
SOME BIG OL' TITTIES
YO NIGGA, CHECK OUT THE TOMMY KNOCKERS ON THAT BITCH.
by Dattittynigga January 12, 2011
13 8
 
4.
Male breasts, man boobs, often covered with hair. Floppy, allowing the dude to easily pass the pencil test. Decidedly unattractive.
Joe: Look at the tommyknockers on that jogger!

Sue: Eww! He should at least put on a shirt before going out in public.

* * * * *

Buffy: Ohmygawd! Our sweaty lawn guy has more cleavage than I do. His tommyknockers are bigger than my knockers!
by Syrotica June 19, 2011
3 1
 
5.
an adolescent who rings a doorbell in anticipation that the aged residents might come out in there underware waving a gun or claiming to have personal connections with the mayor 2) the funnest experience you will ever know 3) a person who can wake the dead with the sound of his slapping balls
Old Man McGinty: We got a tommy knocker round these parts. I swear if i get chance I'll blow his head clean off his fuckin' shoulders
by Tommy Knocker December 13, 2004
13 11
 
6.
Tommy-knocker is when a guy analy fingers a woman with his middle finger, while sucking his thumb on that same hand simultaneously.
That girls ass is so fine. I'd like to give her a quick tommy-knocker
by kishwa tempo February 16, 2014
1 1
 
7.
a popular soft drink with several different flavours including cream soda, and orange. sold in many canadian convenience stores.
Man, this tommy knocker really hits the spot.
by jason biggs June 12, 2002
4 8