stainful 

the act of being a stain. To get shitfaced at a party, poop your pants, and then throw the party poo at your date.

That chick was so stainful, she started making out with the hood of my car.

stainful by Stain March 15, 2005

Strainful 

/streɪnfʊl,ˈstreɪnf(ə)l/

A sensation of discomfort - rather than pain - felt in the muscles when making a great effort.

"I didn't hurt myself in that yoga class but some of the positions were strainful"

Strainful by Matt Windle poet January 10, 2021

stainfucker 

A mixture of Dawn dish soap and Hydrogen Peroxide used to get cum stains out of pillowcases.

Great night last night. Got a mess to clean up, though. Hand me the Stainfucker.

stainfucker by Fuckfingers2 August 16, 2023