To grip onto some one's nipple with extreme force. Not to inflict pain but to subdue them (like a taser).
NO, please don't gripple me officer!!
When one person urinates in someone else's drink without the other person knowing.
"I sure hope nobody gripplenibblets my drink while I use the bathroom"
When a person urinates inside of someone else's drink without them knowing
"I gripplenibblets in that dude's drink"