Dennis Rodman is about to yank the trophy for Most Obnoxious Hollywood Barfly right out of Brandon Davis's clutches. We doubt if he'll be welcome at Memphis anytime soon. We're told he got too rowdy after many cocktails there and started harrassing a waitress. When she resisted his loud come-ons and manhandling he actually exposed himself, before walking - or staggering- out on a $1400 tab. Days later, according to a source, he was out of his mind again at Le Deux where he attempted to pee on the wall inside the club! Bouncers forced him out and he peed in the parking lot. Clubowners are comparing notes and this boozehound will be banned from LA nightlife if he doesn't clean up his act.