1. A girl who has had so much sex, that the mans penis flops round in her vagina.
2. A Man with a small penis, that flops around in a girls vagina.
3. Sad combination of both. (Its likely to happen too, cuz if she has hallway, then she likes the sex, and you have a penis, albeit small, you still have a good chance)
"DudeTracy is a slutbucket, I was flopping around like a Hot Dog In A hallway"