Green’s Dictionary of Slang

1. (US gay) the male genitals.

1965		Guild Dict. Homosexual Terms 20: groceries (n.): The penis when used for oral intercourse.
1972		B. Rodgers Queens’ Vernacular.
1988		H. Max Gay (S)language.

2. the vagina.

1982		Maledicta VI:1+2 (Summer/Winter) 131: Vagina […] groceries and many other terms connotating ‘edible’.
1987		‘Joe Bob Briggs’ Joe Bob Goes to the Drive-In 31: She [...] starts playing the cello while Beatrice Phillippe [...] strokes her groceries.

3. the breasts.

1987

‘Joe Bob Briggs’ Joe Bob Goes to the Drive-In 116: This bimbo pops open a raincoat and flashes her groceries.