Top Definition
The act of walking quickly towards an approaching taxi cab so as to hail and enter it before someone else who is obviously waiting nearby for the same taxi.
Larry: What you upstream me?
Upstreaming Lady: Everybody upstreams you idiot, you don't just stand there like a jackass.
Larry: That's anarchy we need some rules!
Upstreaming Lady: Whatever! (flips the bird as cab drives away)
by NYCurbedFan January 24, 2012

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