Nastiest thing you have ever done.

mine would be, admittedly, pissing in a bottle and forgetting about it and spilling it on me 1 week later.

Well that's pretty nasty. I think my most nasty thing I've done so far is eating some kebab that was left on the ground.

Ate and enjoyed snake, watched him get his head chopped off, drank his blood, skinned chopped on the grill!

hmmm idk probly that one time when i sneezed and a big green buger size of like 1/4 of a golf ball and ate it

I had anal sex with this girl and had shit on my cock after pulling out

Personally mines kind of like yours but worse imho, I dip tobacco and had a half-full bottle of my spit/tobacco nasties and spilled it on myself when playing Rust.

I unclogged the shit stuck in my toilet with my bare hands since no utensils could reach far enough.

Kiss a fucking horrible girl for a dare... BRUH SHE WAS UGLY AS HELL