Slang. The male copulatory organ. The term very popular in rugger-bugger piss-ups
At the piss up after winning the rugby world cup, Jonny Wilkinson waved his tallywacker at the Australians

Orig. <French 'tallier'=pull + Western Irish mispronunciation of 'wanker'>
by emigre December 15, 2003
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Something used to syphon gas out of a car.
"WOW, that guy just stuck his Tallywacker in a gas tank!"
by Pete Negwaski! June 17, 2006
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Tally wacker is a giant gwat dick that can be swaded side to side with just a mear swing of the hips
Look that Chico just used his tally wacker to cock slap little Abe in the face. man is that going to leave some damage!
by Texican May 14, 2004
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a length of rope use to count sheep. The sheperd would tie a knot every 10 sheep. If one slowed up he would whack them with the tally rope.
He hit that ram with the tallywacker.
by sheepfreebird December 19, 2009
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