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A clothing line that stands for "Knock That Thang Off". . Several other phrases are used such as: Get Active, I'm On Tha Grind, It Be Like Dat Sometimes, etc. This is mostly worn by people with amazing amounts of swag. People also use these phrases in everyday talk around the NorCal area.
Andrew: *says something straight up gay*

Antjuan: Man, knock that thang off (Ktto), forreal forreal, dis gotta stop breh...
by AnonymousSwag July 28, 2011