Whats the kinkiest messy punishment you can think of. Looking for some inspiration for my story. Thanks in advance

The funnel. Once the funnel goes in, the rest is inevitable! Funnel down the back even better, but impossible to do solo unless you're double jointed!

Human Garbage Disposal in front of crowd with forced orgasm / fucking machine component.

Dress up in a pvc French maid costume. Invite a bunch of people over then put on a cone dog collar around your neck and have everyone dump their leftovers in the cone until it is full.

I've always wanted to have a woman in lingerie such as a bustier, panties, and stockings and heels at a play party or some other kink themed event walk into the middle of a room full of people there to watch her punishment. Then using about a dozen cans of whipped cream spray it in her panties front and back, in her shoes, in the top of her bustier, and a huge pile on top of her head. She has to stand there motionless so everyone can watch it melt and run down all over her body. If her panties start looking less than full, more gets sprayed in. after a set time the performance is over, but the punishment isn't. Her panties and bustier get pulled down leaving her not completely unclothed but completely exposed. Then the audience files out, though each has a pie which they smash in her face as they leave.

Mine has always been having a dancer doing a striptease on stage, and a rowdy audience throwing rotten tomatoes, pies, cakes, and everything else at her humiliating her while she had to finish her dance

Surely dressed by your victim as they please.. little ballerina or skimpy clown with full make up.. then put into the pillory as the crowd lines up to pie you.. your exposed bum on show under a little frilly tutu from behind.. filled leotard.. and then left a mess while people tease you..