handball, n.¹ — Green’s Dictionary of Slang

handball n.¹

also handballing

[SE hand + ball v.³+ pun on SE handball and balls n. (1)]

1. (US gay) the act of fondling one’s own testicles from the comfort of one’s pocket.

1972

B. Rodgers Queens’ Vernacular 152: fondling the testicles (balls, as in billiards) while the hand is pocketed. [...] handball.

2. (US gay) the insertion of one’s hand and forearm into one’s partner’s anus or vagina.

1988		H. Max Gay (S)language 19: Handballing—fist fucking.
2003		K. Cage Gayle.