Turd. Fex (or faex) is the singular of the Latin word feces (or faeces). Although feces has entered English as a mass noun, fex retains the original meaning of a single, discrete piece of shit.
John said his girlfriend Sarah was a fox, but when I pointed out her lumpy shape, terrible odor, and weight of only 18 ounces, he admitted that she was, in fact, a fex. He cried and cried after we flushed her, and claims to this day that she was the only woman who ever truly understood him.
To trick a virgin (mostly females) into having sex with you. In order to have true fex, the said virgin must believe that they have kept their virginity after penetration.
Dude, did Harry have sex with his girlfriend yet? No better, he had fex with her. Wow, what an ass.