Top definition
The Grundle is the narrow area between a man's ball-sack and his anus.

The "Grundle Days" are those few days which fall between the end of Christmas Day and the morning of New Year's Eve.
What are you doing with the Grundle Days this year?

Nothing.

Me too.
by The Long Kiss Goodmorning February 08, 2005
Get the mug
Get a Grundle days mug for your guy Abdul.