When your woman is acting up and you take her head and put it between your legs and tombstone her, just like on WWE. Then you lift your arms above your head and say "gengis"
A mysterious person or object that near-retards constantly search for but can never find. It is the holy grail for "special needs adult's". You can usually hear them muttering it near public bathrooms or porn shops.
Pronounced 'Gang-Gee'.
"Gengi? Where is precious Gengi??" -Tard "Excuse me sir, you can't stand there." -Bathroom attendant "Gengi?"