It's a Cantonese slang meaning "What the fuck are you doing"
Used in Hong Kong
Pronunciation: "Jo Mud gau" (gau is "9" in cantonese)
It's the abbreviation of " Jo Mud gau", therfore, it's "jm9"
Hong Kong's official: When I said ok, it's ok
citizens: he jm9
by hkcanto December 29, 2018
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A term used in Hong Kong which asks people "wtf are you doing."
Nicholas is watching porn.
Roy: JM9?
by myworldbox February 3, 2018
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jm9=jo mud 9 (gau)
It's a new net language in HK Cantonese means that ''da fuck r u doing?''

jo mud means what's going on/happening?

9(gau) usually means dick, but in here it refers to tf
A Chinese tourist was traveling in HK,and suddenly he shouted in the street: Hong Kong belongs to China!

Then two Hongkongers passed by,
Hongkongers A: Diu...jm9?
Hongkongers B: Who cares! he's on99.
by Mr.Lau January 14, 2018
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