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When the only person in an audience of many foolishly provides a completely unnecessary clap during the middle of a speech, show, gala, event, etc. This is caused due to the person anticipating an audience applause way too early.

The act of idiocy is followed by (a) a surge of heat rising up the spine of the tard which typically leads to complete embarrassment or (b) the unexpected pause by the speech giver and the awkward rise of a half-assed audience applause.

Opposite of the infamous afterclap
"The fag over there preclapped but the man wasn't even done talking. Just keep going Mr. Obama."
by Tuitu March 10, 2010