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1.
A term, which came about in the 1800's, however became popular with soldiers in the Second World War.

A knee knocker is a specific act of casual sex, usually performed in an alley beside or behind a pub/bar/tavern.

The act is performed standing up, with the woman secured against a wall with a combination of the mans upper body and holding her buttocks. The womans legs, usually wrapped around his waist.

This unusual position, whilst having sex results in the knees of the male regularly knocking together (often with some force), hence the term.

Also refer to the term 'knee trembler'.

Grandfather: "Whats the name of that young lady you went to the movies with last night?"
Grandson: "Michelle."
Grandfather: "Arrgh, I met a girl when I was serving in France, called Michelle. We had a knee knocker behind a cafe in Rennes."
by Bucko_NZ November 06, 2007
37 15
 
2.
a very well endowed male
that boys a knee knocker
by fannyfreak July 25, 2003
23 13
 
3.
an old womans saggy tits that hang down and knock against her knees with every step she takes. some men find this erotic and very hot sex can stimulate a penis to pentrate through the knee knockers and enter the vagina.
damn those "knee knockers" are looking sexy.
by jim dandy January 24, 2005
19 13
 
4.
Stretched, low hanging testicles.
His knee knockers were hanging down to his knees.
by big mama L February 23, 2010
10 7
 
5.
When you take your dick, and put it in between the girls calve, and hamstring (where they meet when knee is bent) and proceed to screw it.
Yo man me and Kelly have done every position ever, but last night i gave her the Knee-Knocker
by Heno July 03, 2007
3 14