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A phenomenon that occurs when your friend's boyfriend is shittier than a homeless man on Ex-Lax and therefore makes anything your own boyfriend does look like Jesus walking on water in comparison. Inadequate in general, but especially in the bedroom.
Examples of the Keith Effect:

Girl: Oh, honey, you got me a burning bag of dog shit for my birthday? You're so sweet, unlike that Keith guy!

Girl: Oh, honey, you remembered my name! God you're wonderful!

Girl: Oh, honey, I'm so glad you've only cheated on me fifteen times; I heard that Keith guy cheated on his girlfriend a hundred.
by alittlebirdvacuum July 05, 2011
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