cop the bun

cop the bun (third-person singular simple present cops the bun, present participle copping the bun, simple past and past participle copped the bun)

1. (rare, dated) To take the biscuit; to top everything else.
   • 1894 June 2, Punch:

     But that which "cops the bun"
     Is your sound crack about brave Jack,
     "The Man behind the Gun!"

   • 1918, Edgar Rice Burroughs, chapter IX, in The Land That Time Forgot:

     "Tell me," he demanded, "how to throw a man over my head and break his neck, for I am going to kill you, and I wish to know this thing before you die." Of all the ingenuous declarations I have ever heard, this one copped the proverbial bun.