To 'flip someone off' or 'give the middle finger to someone' with both hands at the same time.
I needed to quit my job, so my friend told me to 'throw um up dubs' office space style and get outta there.
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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"
winning a competition or game; being victorious at something
It’s time to start picking up dubs on Fortnite!