Top Definition
Rhino and sphincter combined. Meaning getting a rino in your anus also known as the sphincter. Knee into ass equals rhinosphinctorous.
It really hurt when I got a rhinosphinctorous.

I kneeded Caitlin in the ass and gave her a rhinosphinctorous.

Shes a fucking rhinosphinctorous.
by rhinosphinctorouslover August 17, 2010
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