Top Definition
The Green Banshee is another word for Mountain Dew, a highly destructive sodie-pop. The reason for this name is the fact that Mountain Dew is green, along with the fact that it keeps you awake for hours on end, just as a screaming Banshee would.
Greg: How was your weekend?
Ben: I spent it with The Green Banshee. I was up for 97 hours straight!
Greg: But...but the weekend lasts only 55 hours.
by Ben E. March 04, 2008

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