Pretending to be drunk/slightly buzzed so people will not judge/take you seriously if you make a fool of yourself or say something stupid. Liberates you and helps you have fun and loosen up at parties, minus the brain damage.
"Dude, I'm the world's best drunk driver; five time gold medalist."
"Are you a Pseudo-Alcoholic?"
"Yeaaaasassahaaaaa man, of course ii erm, man"