57
Underpants, Underwear, be it Boxers, Briefs, Thongs, high rise, low rise, cotton, rayon, or polyester.

Grundles is actually short for grundlemires, as panties is short for underpants.
If you cut somebody off in traffic and they start flipping you off or shouting obscenities, simply say "Hey, don't get your grundles in a bundle, pal."
by Sara B Ellum December 21, 2010
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The vengeful act of crapping on a lover's chest while they sleep.

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58
adj. The hair between a mans ball sack and anus. Often used as an insult.
by matt c. November 03, 2004
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59
The gap between the males anal opening and Penis.
I have a rash on my Grundle.
by Jill May 02, 2003
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60
the soft, sometimes hairy and wet, area between your genitals and anus.
Hey guys! Check out my grundle tatoo!
by Andy July 23, 2003
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61
the scottish term for the area between the anus and the coccyx... a term misunderstood as the perineum in most countries, but a often spoken about phrase in the likes of wishaw and motherwell. Well used also by the healthcare profession
"i keep getting wakened up by a pulling of the grundle, like I'm being pulled up and down in agony"

or

I have too much hair on my grundle
by the anaconda October 12, 2010
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62
(verb) To place an object in the area between your testicles and anus (i.e. the grundle). This is generally done when attempting to bring prohibited items into a venue where entrants are patted down.
"Yo Thabius, make sure you grundle that bowl before we get to the security check-point."
by AppleJax September 04, 2006
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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63
A protuberous underside. Particularly on an adorable animal.
My cat has the wobbliest grundle.
by Abiy0y0 February 26, 2017
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Golden Shower Plush

He's warmer than you think.

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