Well it's not the definition, moreso one of the main symptoms. But you're right that drinking alone is boring...

[Crono]

<div style='font: 9pt Arial; text-align: left; '>Most of the point of drinking, is to have fun with friends, who'll most likely also be drunk... so you can all act goofy and etc. That, or, you'll want girls to be there so you can score, but that's a whole'nother moral debate thread right there.</div>