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1.
Used in the Midlands. The act of bellowing at someone "down the street", especially from a window. Also used for communication within households that avoid personal contact. Often volume obscures pronunciation.
"Stop your yawping, mam"
by Porkling July 02, 2004
 
2.
Emitting a loud barbaric cry or sound.
Your yawping could be heard over two miles away.
by Flying Monkeys April 23, 2008