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1.
A woman's boobs that are so large that when she lays naked on her back they touch the sheets of the bed.
Man 1: "Look at the size of those jugs!"

Man 2: "I bet those are sheeters."
by bartfarkel August 20, 2008
 
2.
The instantaneous ability to know the geography of any location on the Earth by stepping off the train/tram.

The naturally occurring GPS within one’s mind which prevents any confusion of travel and also recognizing the shortest possible route.

The act of laying sheets.
You're a Sheeter, you just led 30 American's around Europe without looking at a map!
by j-bonz July 25, 2011