Formal written
請問你在做什麼？
Everyday spoken
你做緊乜嘢？
Internet slang
你做乜9？
Note: The 9 stands for 鳩, a vulgar intensifier. Fine among friends, not for your landlord.
請問你在做什麼？
你做緊乜嘢？
你做乜9？
Note: The 9 stands for 鳩, a vulgar intensifier. Fine among friends, not for your landlord.