This happened to me recently in the garage !
I ate two small Twix bars and took some cough medicine earlier in the day. I was bending down sweeping up my toenail clippings, my stomach growled once and before I could stand up the hot liquid shot out of my butt. I seriously could not stop it. I clenched, it didn't work. No gas, no warning, it just flowed.
Praying my husband wouldn't come outside I closed the garage door, stripped off my pants, ran to the guest bathroom and washed up. Thank God I keep a robe on the bathroom door. When he saw me in the robe he asked what was up. I laughed hysterically. Then he told me his poop stories.
Shit happens. Yes it do, do.