Top Definition
When a sexually frustrated male college student takes sexual advantage of male dorm/flat mates while they are passed out from excessive partying. This usually involves anal probing of the unsuspecting victim.
"My ass hurts. Did you Harry Assmaster me last night?"
"That poor guy. He got totally Harry Assmastered last night"
"Have another drink buddy because I am going to Harry Assmaster you later."
by crunchbitemsc November 03, 2011

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