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1 definition by Doctor Asshat, MD

The act of inserting one's thumb in an unsuspecting ass.
Tom: Man did you hear about Nik the other night?

Markus: Naw man what happened?

Tom: Got super tanked and thumbdoukened some beezy!

Markus: Whoa, bra that's fuckin sweet!
by Doctor Asshat, MD January 25, 2009