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1.
When one drops trough and proceeds to wipe one's filthy butthole on a public surface, such as a public bench, street, or public causeway.
"Man someone just colonial bootscraped the shit out of this payphone."

"Man, Im just gonna have to get some new undies. I colonial bootscraped right through this woven cotton support layer."

"Who colonial bootscraped the seat. that's not cool."
by Cpt. Fart Koala February 25, 2013