Top Definition
the any day of the week in which mass quantities of alchol is consumed followed by an evening of hard rough sex that makes your partner wake up the next morning and say "damn, the best days are Gildays"
i hope today is a Gilday!

yay Gilday is finally here

yesterday was a Gilday

i could really use a Gilday about now
by Skot BAcon February 03, 2010

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