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1.
The knowledge a mass of people share which causes them to know when to stop clapping. Can sometimes malfunction and cause the clapping to never end.
.at the end of a political speech.
"Dude did you feel the clapathy between us?"
"Yea man, it was beautiful"
by Feege November 23, 2008
 
2.
When an audience grows weary of clapping, either at a ceremony or musical performance.
"That graduation ceremony was so long, I got clapathetic!"

"I was clapping at the beginning of the song, but I quit when I got clapathy."
by B. Kennison December 05, 2007