n. Soiling of the back with feces, typically used in the context of an infant who has overfilled a diaper while supine. May be considered a variant of code brown.
Mom: Sweetie, can you change the baby? He has backpoo.
Dad: Sure, hon. That's a whole outfit change he'll be wanting.
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the act of sex when you shit on your partners back and tell him/her that this cute little hedgehog lives there from now on
Ist it ok if i give you a wessex backpoo-hedgehog tonight? i have already bought the salt-sticks