buttprint

noun

noun

Etymology From butt + print.

Canada, US, Slang The mark or impression left by buttocks having been pressed against a surface.

Putting a dirty buttprint on the bed probably wasn't the nicest thing to do, but it couldn't be helped.2011, Mike Mullin, Ashfall, page 30:

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.