"Please note, it should be a photo that you don't mind getting besmirched."
Merriam-Webster definition: to be smirched.
To be honest, I don't know what to make of it. What could it be used for? I race through the possibilities:
Dart board Pin the tail on the groom
Three socially outcast high school girls dabble in occult practices, and when they notice that the new girl has the powers of a natural witch, they talk her into joining their coven.
A depressed and directionless high schooler befriends the band of troubled women in her ward at a mental institution.
The Sisterhood of the Traveling Pants
Four best friends spend their first summer apart from one another and share a magical pair of jeans, which inevitably gets besmirched with all of the adventures and traveling and passing around of the pants.
And finally --
Very Bad Things
A prostitute is killed during a Las Vegas bachelor party and hilarity ensues.
"OMG, Bridget totally besmirched the crotch on our pants."