Top Definition
To beat your partner with your penis during sexual activity.
Tallywhacker
by Charlie-O March 09, 2009
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 December 28, 2015
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