A female drug user/junkie ("interavenous"/i.v. user) that uses her body to manipulate any one - I mean ANY ONE- to obtain her drug of choice. She will do absolutely any type of sexual favor(s) that she deems fit- stoop to the lowest low to get her "fix". She is generally considered the dope man's cum dumpster.
The word puddle is used in reference to the puddle of melted substance on a junkie's "banging spoon". With which is then drawn up through the syringe and shot directly into the users vein.
That girl is the biggest puddle slut- she's an obvious banger- all a guy needs is a baggie to steal her panties!
Jim: Hey Jeremy, I was thinking of hooking up with Susie down the street while at your party. Mind if I borrow the guest bedroom?
Jeremy: OH HELL NO! Dude, don't even bother! Don't you know she's a total Puddle Slut? Caught her having sex with Josh under the school's bleachers for meth.