Coproflatuphobia 

Coproflatuphobia - An abnormal, persistent knowingly irrational fear of sharting (Accidentally shitting yourself, while farting.)

I really need to fart but I'm afraid I might shit myself if I do. I'm suffering from Coproflatuphobia.

Coproflatuphobia by Big Sherm Dawg April 4, 2011

Coproflatulophobia. 

The fear of defecating while being flatulent.

A local man died in a car accident after being shartled by his coproflatulophobia.

Coproflatulophobia. by Ol' Scruffy September 15, 2021