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1.
A frightening creature most frequently used to scare children.
"Eat your carrots or I'll let the groke out again!"
by Alan March 02, 2004
 
2.
Groceries, or anything bought from a grocery store or supermarket. From the abbreviation "GROCS" which appears on receipts.
I'm going to take the SUV to pick up the grokes.
by witchdoc64 April 21, 2011