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earlier then the crack of dawn. the grundle is darker and more irritating to wake up at.
"you need to be up at the grundle of dawn to be to work on time"
by matty_p August 26, 2008
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2
a statement used to express an extremely early time to wake up in the morning. more specifically, an hour or 2 before sunrise.


"i gotta get up at the grundle of dawn tomorrow..."
by gamerking7 August 01, 2008
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