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.
by Cherry Darling October 10, 2008
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will only fuck one person at a time; serial monogamist, even if the other person involved is not
I get that you're married, but I don't want to date other people. I am more of a one horse Sally.
by Aspeckof April 8, 2017
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Pussy, Vagina, Wuss, someone who is afraid to say or do something.
Marty: I have a huge dick.
Lindsey: Prove it.
Marty: No, I don't wanna scare you.
Lindsey: Don't be a fuckin sally horse.
by tessab yesdnil June 24, 2015
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