1 definition by ZOMG-7G7-GMOZ

A elf that hides under your mattress and puts on your night cap when you are asleep, at exactly 11:59 and 32.5 seconds
My night cappin elf put my night cap on for me when i was asleep and has the name of steve.
by ZOMG-7G7-GMOZ April 6, 2010
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