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An act of complete and utter inadequacy, usually perpetrated by an absolute clown of a person, resulting in an embarrassing and error-strewn conclusion. "McKnockon" can describe both the act or action itself, as well as the perpetrator of said act.
Bob: So what happened to you last night? Get in with that bird?
Paddy: Nah mate - I was well in, but then saw off 9 pints with sambuca chasers and couldn't get it up
Bob: What an absolute McKnockon of a move. How did you McKnockon yourself so badly?
Paddy: Dunno. I am a total McKnockon head
by Carnage Bob June 06, 2011
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