Verb: Ruin, thwart, dull, put a dent in or jacked up. To mess up. It's formally used as a noun, but most appropriately, the word is best used as a verb.
I've just foibled his evil plans. Muahaha.
OR I've foibled the tip of his sword.
by crystales December 28, 2013
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To make a mistake directly causing the failure of a plan or action. Portmanteau of Foil and Fumble.
The Green Shift idea was a major foible for the Canadian Liberal Party in 2008.
by Death Monkey April 04, 2009
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1. Problems that, when serious, cause failure or the symptoms of failure.

2. The #1 cause of fagalism in the U.S.

3. Elton John,jk.

4. The STD known to make you suck.
1. 9 out of 10 people failed today because of foibles.

2. Only you can stop fagalism by preventing foibles.

3. No.

4. Mary broke up with John because of his foibles.
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