When two lesbians scissor so ferociously that their grundles emit a thumping noise
Bro did hear those dykes grundle thumping!
Another name for a mans cock and balls, or...
When a gay orgy is in progress one takes a handfull of a mans section between his anus and balls and bites it.
No More Grundle Bundling...YOWW
The art of putting on stilts and tea bagging another person.
My girlfriend was laying in bed because her head was spinning from the vodka she drank so I had to have her stand up to give her the grundle stiltskin she would never forget.
The area on the face between the nose and upper lip.
When we were kissing I missed her lips and accidently kissed her face grundle. It was awkward....
Similar technique to the dirty Sanchez with the difference being where the lint, cheese, and or sweat is scraped from ones grundle area and smeared under the nose or across the mouth of an unsuspecting individual to simulate a mustache or grin of grundle goo.
After a laborious day at work, upon arrival at the divorce lawyers, I greeted my ex wife with a sour grundle grin.
when you are plastered off your arse and you hook up with someone so hideous not even fugly can cover how revolting this person is.
"oh man i heard you hooked up with a grundle crust."
"please..don't remind me."
During a fart, when air is compressed between the grundle and a hard surface- the air erupts to the nearest exit, usually out the front of the crotch. It is thunderous, not just for the thunderous noise it makes, but also because of the unsettling direction of the blow.
I had a serious thunder grundle in math class, i think i sprained my taint.