An excuse that is made for being unable to perform a task due to equipment failure or lack of fortitude.
Bob was going to ask the girl at the bar for her number, but he went soft on the way over and just ordered a drink.

Bob's laptop battery had gone soft so he had to plug it in to continue the presentation.

Obama said a lot of things to get elected, but he's gone soft and nothing has changed.
by Solarnomad February 17, 2010
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