Downchucking 

To have diarrhea

Dude was downchucking all night on the toilet

Downchucking by Tamwardo March 5, 2020

downcracking 

Surreptitiously taking a photograph of a builder's bum.

Brad got caught downcracking in the chip shop, but Christopher Chope says it was ok.

downcracking by robuttt July 10, 2019