Ideonatomy

A unique personal anatomical quirk, disfunction or oddity. One's awareness of how our own body differs from the norm.
(Theoretical example: having more than one functional penis - with all the complications that could arise)
Must be physical/biological, not psychological.

(From above) "Due to the nature of my ideonatomy, I can urinate in two different directions at the same time."
Taken from "ideo" (ie: ideosyncratic) prefix and spliced with anatomy, dropping the initial "a" to make the contraction.