Top definition
Acronym or Initialism meaning: 'Not yet known'.

Also, a rare variant abbreviation of the name 'Nicholas'.
Text message conversation -
Jane: The father of the child is nyk.
John: Nyk got her pregnant!?
Jane: Noooo! It's not yet known who the father is.
by atheneus February 02, 2010
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2
a extremely hot person that knows how to have fun. Doesn't like to be labeled and is a kitten :*
Wow he must be a Nyk.
by Justakittenfan January 03, 2014
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