A person who is usually kind yet serious. A Kuan Tong is usually outspoken and insults others when he feels like it
Person 1: “Hi Kuan Tong”
Kuan Tong: “Shut up”
When you are unsure of the term you will use but is something you fully understand but cannot properly articulate because you either don't remember the term, or don't know the term.
Hello, how are you? ..." I'm, tehee, kuan gud, yknow na, sexy kyaa~"