Chai is tea. Wallah, or Walla, is a person who performs a specific task. So chaiwalla is a person who serves tea basically. It's regarded as an insult in the movie Slumdog Millionaire because a person who serves tea is considered to be a low class job.
QRPG stands for QuickRpg (rpg stands for Role Playing Game) or QlilpRpg. QRPG is a browser based game making product produced by qlilp.com. Instead of taking hours making a browser based game, you could use the QRPG maker to make games in a couple of days.