Green’s Dictionary of Slang

the penis.

1870		Cythera’s Hymnal 7: But arranging his person, he sat in his chair, / While his Tommy kept rising like yeast.
1896		Sheaves from an Old Escritoire 53: In a moment his naked Tommy, with its pink head was in her hand [Ibid.] 92: He endetvoured [sic] to thrust his Tommy into my palpitating quim, but the little entrance was too small for his large boy.
1965		Guild Dict. Homosexual Terms 35: Penis [...] tommy.
1966		Trimble 5000 Adult Sex Words and Phrases.
1972		B. Rodgers Queens’ Vernacular 50: the penis [...] tom-tom (Usu in the expression beat the tom-tom = to masturbate).
1978		L. Kramer Faggots 321: Think schnitzel, [...] tom-tom, wand, wang, [...] worm!, Ying-Yang!