1. (Universal) Any individual who has the proclivity to drink excessive amounts of
alcohol in a relatively
short amount of time.
2. (Social) It
may also be used when referring to someone who becomes intoxicated easily or has difficulty holding their liquor.
1. Damn, you're such a lush, you just drank a whole fifth in three hours. You
may need to seek treatment tomorrow.
2. That girl and the
guy she is with are such lushes, they've had 2 beers each and they're already acting
obnoxious.