having a period; menstruating.
better put a plastic sheet on the sofa before thunderthighs sits down, she's riding the cotton pony.
by Dunky Oggins November 23, 2003
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A term used to for a female having a period. It references using a tampon (the cotton pony).
I had cramps all day because I'm riding the cotton pony.
by damedonna July 03, 2006
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