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1.
It means bad weather. The kind of weather which makes you miserable: dull, grey and wet. If it rains hard and water runs down your neck it's dreek.
'It's a bit dreek today'
by Johnny Garth December 14, 2007
 
2.
Dreek is a shortening of the terms 'dork', 'freak', and 'geek' into one conveniant word. It is either an adjective or noun. It can be used offensively, or even as a positive term.
1.) "Jesus Christ...you're such a dreek!"
2.) "I'll admit, I can be a total dreek!"
3.) "I love you, you're one cool dreek!"
by Finn D. Fish June 28, 2009