1. a nasty, STD-ridden, "i wouldnt f*ck you with HIS dick", missing teeth, stinky prostitute
2. code word for nuts on your back
3. a girl who is more than a little slutty but doesnt seem to realize it, and when confronted about it, she "has no idea what you're talking about"
4. Kim from bus 5063
That girl in those hoochie mama shorts and half shirt is such a sally horse!
Vivian's new boyfriend pulled a sally horse on her. She wasn't too happy about it.