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up in his grundle 

A phrase describing being so close to someone that it is akin to being on a man's grundle
Person A: James was so close to Nick that he could feel his breathe.

Person B: Yeah, James was up in his grundle.
up in his grundle by Juno992 April 4, 2010

Grundleduce 

An especially aggressive bowel movement, usually performed while performing an outdoor activity.
We were camping and I had to take a grundelduce. So I climbed up a tree, pulled down my pants, and screamed bloody murder. Grundleduce.
Grundleduce by JooManG May 28, 2018