Green’s Dictionary of Slang

bush dinner n.2

[bush n.1 (2a) + SE dinner]

(US) cunnilingus.

[US]‘R. Blake’ Amer. Dict. Sexual Terms 26: bush dinner (Vulg Sl) A performance of oral intercourse on the female; cunnilingus [Simes:DLSS].
[US]Trimble 5000 Adult Sex Words and Phrases.
[US]B. Rodgers Queens’ Vernacular 139: The vagina when erotically licked. [...] bush dinner.