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Short for sleeping with the lights on. Also seen in the form SWTLOed. This is the past tense form of SWTLO.
Dude: I SWTLOed last night.
Other Person: Did you see any monsters?
Dude: Hell no
by The Wikipedian October 19, 2011
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Jul 27 Word of the Day
the whale tail is the shape formed when a g-string rides up high over a womans trousers
oh my god look at that butt, her whale tail is showing so high!
by garv November 10, 2003
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