A girl who is about average looking that likes to have random sexual encounters with many guys when she gets drunk. She loves to hook up, give blowjobs, and essentially get railed. This type of girl is every guy's perfect woman because she won't constantly call you, and won't blow your spot. Directions for using a slam pig: talk to her, smash that ass, and kick her out. She'll love it.
slam-pig noun
A woman who engages in promiscuoussexual intercourse, usually characterized by her finding great pleasure in being fucked roughly or ‘slammed’. The reference to the word ‘pig’ in this term is often mistaken as meaning that the woman is overweight, but it actually refers to the glutinous nature in which she engages in sex and often hints at her eagerness to swallow seminal fluid.
"Hey, can you move your bed away from the wallthe next time Evie comes over? The wall was shaking so hard I though my bookshelf would fall over."
"Sorry about that. I tried to slow things down, but she's a real slam pig."