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1.
(Verb)

1) To establish a bold posture only to revert to one's more natural, {pussweed] state.

2) To abandon one's homies in their time of need

3) To welch on a promise.

4) To engage in monkey-ish behavior such as poop flinging.
We thought he was down for the fest, but when the shit hit the fan, he turned into a chickenshit,excusified and then reppsed on us.
by Crash_the_dog April 23, 2008