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1.
commonly referred to as the "WT", the watertower and its surrounding woodland environment located atop Turkey Hill in Arlington, MA is the location of frequent gatherings often consisting of substantial amounts of alcohol and uncontrolled vomiting. On certain nights, thrill-seekers can be found around the watertower usually on the verge of unconsciousness.
Bob: "Dude, i dont remember anything about last night

John: "Ya man, that's usually the result of a great night at the watertower"
by H2Ochugger March 17, 2010
 
2.
When a guy grabs his nuts at the base and pulls them out and away from his body, thus creating a shape resembling a water tower.
I wanted to get your mom in the mood last night so I showed her the water tower.
by Ted Worthington October 07, 2005