The phrase came from Hebrew (LAMA KACHA?), can be used if someone did something wrong and/or bad to you or in general to human kind...
Can be also used in situations of surprise (most likely a bad surprise) said after a shocking action or an insult.
1. #1:"I fucked your wife"
#2:"Why like this?"
2. #1:"You are sooo stupid man..."
#2"Why like this"
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