an exclamation of impatience or derision.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an informal word for yes, often used to indicate derision or contempt
an exclamation of derision or disgust
British informal an affected upper-class person
Word Origin for Yah
C20: from yah, the spoken form of yes supposedly used by upper-class British people
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
exclamation of defiance or dismissal, from 1812.
Online Etymology Dictionary, © 2010 Douglas Harper