Dub er up
Refers to doubling anything up however in this context it specifically refers to either drinks or girls.
"Man its about time I get this girl and Dub er up"
Guy 1 says "What are you doing tonight?"
Guy 2 says "Dubbin er up with a dub er in hand"
Guy 1 says "What are you doing tonight?"
Guy 2 says "Dubbin er up with a dub er in hand"