something that Sekretsu can't find out what it means.
"No, I'm not going to hentai.org to find out what sister penis is."
by Iking01 March 22, 2015
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Almost as good as your moms cock but not quite! It’s more slimy but it’s a little smaller! The one thing though is it’s fatter than your moms cock!
by The_Dank_Kid-69 February 22, 2018
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Sisters or friends that have both had sex with the same man.
Shelly and Sarah are penis sisters now that Sarah is banging John.
by Boss Panda December 29, 2022
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