strangle a darkie

Same meaning as choke a darkie, ie to crap/shit/defecate. The word "darkie" relates to the usual colour of poop.

I was just about to leave the house when i had a sudden urge to strangle a darkie, so i had to use the bathroom before i went out.

Strangling a Darky

taking a huge shit.

Tom: "Why were you taking to long in the bathrooms?"
John: "Strangling a Darky sorry!"