(transitive verb) to smuggle contraband into a venue (concert, sports, bar, etc.) that involves a pat down by stuffing said contraband into the back of your pants at the very top of your butt crack. Works best for ladies with large asses.
Becky buttbeered a Tecate into the club because she was too broke to pay marked-up bar prices.
Danielle buttbeered her umbrella into the Jay-Z concert and got through security with no problem.