Top Definition
A social network with which high class, well-dressed Englishmen send self-destructing photographs to each other, typically showing themselves participating in high class activities and/or being well dressed.
"Cheerio good sir, may I have your ChapChat?"
"Bloody hell! Mr. Pemberly has deactivated his ChapChat!"
by MrNiceGuyMcGee July 15, 2014

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