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1.
Slang term for Mountain Dew, now known as Mtn Dew. Portmanteau of Dew and brewskie (slang term for beer).
"Yo Steve, get us two Dewskies pronto!"
by Justin Herbert April 10, 2009
 
2.
a bottle or can of Mountian Dew.
"I'm gunna go buy some Dewskie."
by wedge April 11, 2003