Green’s Dictionary of Slang

(US black) to have sexual intercourse.

1965		C. Brown Manchild in the Promised Land (1969) 119: She was the first white girl I ever jugged.
1967		M. Braly On the Yard (2002) 24: But I seen this chump and he looking fat, fat, and I knew I could play on him, so I shoots. Ask him did he want to juge a colored girl.
1974		(con. 1945) M. Angelou Gather Together In My Name 166: They tell you how beautiful you are [...] And wonder what you’re doing being a whore all the time they’re jugging in you.