The conjunction of the words prostitue and hooker. Used to describe a girl who is slutyer than both a prostitue and a hooker, or used as a derogitory term to someone you don't like.
Ex. 1 "That Courtney is such a prostihooker, she probably spends most of her time on her knees." Ex.2 "Leave me alone you fucking prostihooker!!!!"
by Xero _ Manifest December 10, 2010