In Korea, this is an expression/outburst used when someone has been embarrassed, offended or annoyed.
Or, used to object something.
Example 1:
Wife-"I swear his snoring kept me up all night."
Husband-"Yah! I don't snore."
Example 2:
Friend 1: You were totally wasted last night.
Friend 2: Yah! I only had one drink...
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