Green’s Dictionary of Slang

1. the vagina.

1959

in E. Cray Erotic Muse (1992) 407: So I took down my pants and I crawled in between, / And I started to sew on her sewing machine.

2. the penis.

1972		B. Rodgers Queens’ Vernacular.
1978		L. Kramer Faggots 321: Think schnitzel, schwantz, sewing machine, slug, spout, sword, tom-tom, wand, wang, water pistol, weener, wienie!, wheezer!, wishbone!, worm!, Ying-Yang!