'chai' means tea & 'wallah' means a person who does a specific task, so basically chaiwallah means a person who makes tea - an occupation which is generally held by those with a lower status in society.

some people consider this term derogatory.
"now i know why my cellphone bills are so high, they tip the chaiwallah in $100 bills." prem - slumdog millionaire
by bigbrowneyes January 13, 2010
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