Make sure you know the definition before you start using it casually as he has!
> Noun. grundle (plural grundles) (US, slang) The area between anus and scrotum in a male or between anus and vulva in a woman. [0]
> Noun. grundle (plural grundles) (US, slang) The area between anus and scrotum in a male or between anus and vulva in a woman. [0]
"I will take the 8 oz steak, smashed potatoes with gravy, cauliflower with cheese, a side salad with house Italian dressing, and can you please make it grundle?"
"Thanks for stopping by. When you get home, tell your grundle I said was thinking about them."
I realize this isn't good HN material, but I couldn't resist.