To jack off.

Also known as: slippin' the fishy, spanking it, choking the monkey, cranking the pecker, or teaching the one-eyed china man how to dance.
"Please, tallywack me darlin.'"
by Poke My Poker April 14, 2004
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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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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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