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When someone is caught committing a crime (mainly one sexual in nature, but can refer to all crimes), with overwhelming evidence to prove they did it; in their defense, the culprit denies that they were the one caught doing the crime.

Derived from the Shaggy song "It Wasn't Me", which describes a man being caught having sex with another woman by his wife, and subsequently denying that it was him she actually saw.
When caught on video having sex with a 14 year old girl, R. Kelly employed the Shaggy Defense; he just denied that he was the one in the video.
by runfromcheney May 20, 2010
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