Green’s Dictionary of Slang

tallywhacker n.

the penis.

1919		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 365: Rattle up a cat’s ass, pennyroyal tea, / The girls won’t leave my tallywhacker be! / So God damn’ sore I cain’t hardly pee, / The girls won’t leave my tallywhacker be!
1922		in V. Randolph Pissing in the Snow (1988) 99: A woman is mighty lucky to marry a man with a fine big tallywhacker like I got!
1929		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 113: Sung as above [...] In the chorus, line 1: tilly-whacker sometimes talley-wagger, or dilly-whacker, meaning the penis.
1934		‘J.M. Hall’ Anecdota Americana 2nd Seri. 50: ’E ups me and ’e downs me, ins, me, outs me, wipes ’is tally-whacker on me petticoat and goes orf.
1940		in V. Randolph Pissing in the Snow (1988) 65: ‘These farmer boys ain’t got but one pecker apiece, but I’ve got two.’ The girl never heard of such a thing before. ‘You’ve got two tallywhackers?’.
1950		in V. Randolph Pissing in the Snow (1988) 102: The old man pulled out his big long tallywhacker.
1961		(con. early 1950s) J. Peacock Valhalla 137: Shinny up a dog’s hind leg, cat turd tea, the girls won’t let my tallywagger be.
1967		(con. 1950s) McAleer & Dickson Unit Pride (1981) 270: You can’t keep your tallywhacker in your pants?
1970		E. Thompson Garden of Sand (1981) 18: Just like his goddam father, may his tallywhacker rot off for all the dingy places it has been in instead of me.
1972		R.A. Wilson Playboy’s Book of Forbidden Words 239: Tallywagger (or Tallywhacker). The penis.
1981		(con. 1966) P. Conroy Lords of Discipline 217: Like instead of saying ‘dick’ or ‘prick’ or ‘talleywhacker,’ I suggest you use the word penis.
1992		(con. 1920–57) Randolph & Legman Ozark Folksongs and Folklore II 787: Other common names for the male organ are [...] tilly-whacker.
1997–2002		Hope College ‘Dict. of New Terms’ 🌐 tallywagger n. A slang term for the male organ of copulation. Most often used among teenage girls.
2000		C. Cook Robbers (2001) 296: Nothing left for those strutting peabrains in D.C. to do but dip their tallywhackers and run for reelection.
2016		T. Robinson Rough Trade [ebook] [H]e stuck his tallywhacker into whoever he wanted to.