like an octopus except with five legs. hence the prefix "penta" as in the terms meaning five.
larry drew a picture of a very happy pentapus on the chalkboard.
by cowtacular April 1, 2008
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A vagina that has been touched by five different penises
yea, __(girl)___ had sex 20 times, but shes still just a pentapus
by baylork4 November 24, 2010
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