adj.
To slap another person with one's (flaccid) penis, shouting "Tally Ho!" before contact is made. Without the exclamation this is simply sexual assault.
While getting ready to go out last night I Tallywhacked my roommate.
by Scooba_Steve October 29, 2015
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1. noun The part of a man interested in a tallyho.

2. The part of a man a tallyho could care less about.
Hey man, don't forget to bring protection for your tallywhacker when you go to a party.
by Ron April 2, 2004
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a cock, strudel, penis, shaft, meat and two veg, etc a description of the appendage between a males legs
"hey sweety, you wanna see my tallywhacker?"

"princess, how good would a mouthful of tallywhacker be?"

"bend over! here comes the tallywhacker"
by tania January 27, 2004
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A Tallywhacker is a stick that is used to keep score. (originally) and yes, a vernacularism for dong.
by cyphercube November 6, 2003
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part of the male genitalia, as used for whacking tallies
I'm just off to the little boys room to show my tallywhacker the toilet.
by robbo December 7, 2003
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A stick used to count bunches of bananas as they were loaded on banana boats. The workers were paid by the bunch.
Come Mr. Talley Man and Tally Me Banana.
by Charles January 4, 2005
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