Green’s Dictionary of Slang

wapee n.

[? wap n. + familiarizing sfx -i/-y]

(W.I.) sexual intercourse.

[WI]S. Selvon ‘Finding Piccadilly Circus’ Foreday Morning (1989) 123: He only come to see [...] if he could introduce some wapee and sebby-lebby and bounce-dice to the hot boys over here.