The video below shows you how to use the drunk cheat in GTA 5. Essentially the cheat simulates what the game would be like if you had in fact just dropped a 40! Dizziness, falling over, stumbling, poor aim and stupidly bad driving skills are all symptoms of drinking too much Hennessy (or any other alcoholic beverage)!
https://www.youtube.com/embed/9Qr8RyPX8mA
Anyway enjoy the clip and be careful before using this cheat...
And in case you forgot the different system codes for the drunk mode cheat, they are as follows:
