Any act, event or achievement that causes feelings of pride or boastfulness. I.E. Something which is a "feather in your cap."
After she broke up with me, I nailed her mom...capfeather!

I just got hired as NASA's first rock'n'roll astronaut. If that's not a capfeather, I don't know what is!

So I'm dating a professional contortionist...capfeather much?
by Actorbatic June 13, 2010

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