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1.
to drain or drink via large straw
Drainage! Drainage, Eli! Drained dry, you boy!If you have a milkshake and I have a milkshake and I have a straw and my straw reaches across the room and starts to drink your milkshake, I drink your milkshake! I drink it up!
by MClem March 01, 2008
 
2.
Complete, utter, humiliating pwnage, leaving opponent in shock, disbelief, and despair.
Daniel Plainview: It's called drainage. I own everything around it, so I get everything underneath it.
...
Drainage! Drainage, Eli, you boy. Drained dry. I'm so sorry. Here, if you have a milkshake, and I have a milkshake, and I have a straw. There it is, that's a straw, you see? You watching? And my straw reaches acroooooooss the room, and starts to drink your milkshake. I... drink... your... milkshake! slurp I drink it up!
by Anomaly9999 April 28, 2008