Top Definition
the nutritious drink formed by the sweat between your anus and ballsack.
after taking his face out of ferman's ass, kenny quickly realized it was smeared with grundle sauce.
by beastiality December 06, 2005
the juices or sauce that forms between your asshole and nutsack. also known as duck butter
damian love his grundle sauce on his breakfast toast.
by kne December 02, 2005
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from We'll never spam you.