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1. Oral sex in Cantonese
2. To express one's frustration
1. If you did bad on a test, you say "Hum diu!"

2. "Rahita rahita!!!(high voice), "Bushan...Bhushan...!!(low voice). you say "HUMDIU!"

2. If someone pisses you off, you tell them to "Hum diu"

3. If you rear-end a car, you say "hum diu!"
by bboy_ronny April 01, 2009
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