kowtow chow, n. — Green’s Dictionary of Slang

kowtow chow n.

[SE kowtow, lit. ‘knock the head’, ‘the Chinese custom of touching the ground with the forehead in the act of prostrating oneself, as an expression of extreme respect, submission, or worship’ (OED) + chow n.¹]

(US gay) the act of performing fellatio while kneeling in front of one’s partner.

1972		B. Rodgers Queens’ Vernacular.
1988		H. Max Gay (S)language.