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The act of having a penis in your anus for at least one hour, preferably longer. The penis must also be at least 7.6 inches in length, and must be human.
"Ayo Jamal, hows that Penanus hanging in there?"

"My penanus is 13 inches long, fuck you!"
by Jamal Smith Nigga November 05, 2011
a cross between a penis and anus
Bill is a penanus.
by Tony November 14, 2003