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1.) The act of masturbating while hanging upside down. Ideally batsturbating is performed in a dark basement or cellar. Often batsturbating is accompanied by clicks used for the purpose of echolocation.

2.) The word used when one is binge watching the Christopher Nolan Batman movies.
"Have you tried batsturbating? It's a real headrush."

"I'd watch the new DC comics Batman movies starring Ben Affleck, but I'm going to be busy batsturbating."
by burtreynolds@AOL.com February 18, 2018
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