A person (usually female) who consistently chooses profile pictures on social media in which they are wearing little clothing to attract attention to themselves, and gain maximum "likes." Essentially selling themselves out for online attention.
"Yo bro did you see Jessica's new bikini prof pic? She got 450 likes!"
"Yeah cuz shes such a profstitute doe."
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failure shower.