A spread-eagle slampig, or "slammy," for short is a adjective describing a loose woman or man. In other words, someone who is openly sexually active and is usually associated with being dirty. Very easily become sexual prey or is willing to engage in sexual acts with strangers.
I.E. in the military these women or men are considered "moral gear," where anyone willing is able to have a turn.
Example: "I thought that girl was a slut before, but she's been around so much she's more of a spread-eagle slampig!"
(N) The girl at a party with muffin topshanging over her 2-size-too-small jeans, cleavage all poppin' out her shirt and who has been slammed by at least three guys there.
Guy 1: Look, Chris is talking to that hog.
Guy 2: Yeah that's Noey, total slampig. She's like a basketball, we all pass her around when there isn't anything better out there.