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1.
This would be the pubic thatch.
Lol, your grundlebeard is all up in there.
by 31d1 September 19, 2005
 
2.
synonym of ANAL BEARD. Extremely thick patch of hair between the anus and the ball sack, area also known as the "grundle"
Yo Merril shave my grundle beard for me i cant reach.
by SbTrEoVwEn September 25, 2008