all there but the most of you, phr. — Green’s Dictionary of Slang

all there but the most of you phr.

[all is the genitals, the most is the rest of the body]

having sexual intercourse.

1890

1890190019101920193019401950196019701980

1984

1890–1904		Farmer & Henley Sl. and Its Analogues.
1984		Partridge DSUE (8th edn) 15/1: [...] mid-19C–20C.