If you've already got a flask, you're already the cool drunk guy -- the suave asshole with a drinking problem.
[$29, Etsy]So you wanna be a badass, eh? Who doesn't! Everyone swoons over the bad boy. Who can resist the full sleeve, that pompadour, the cigarette pack rolled in the shirt sleeve, and the drunken swagger from too many swigs of the flask.
Though you really shouldn't have to rely on alcohol to gain confidence, it certainly relaxes your nerves and socially lubricates you enough to go up to that pretty girl/handsome dude at the party.