Certain or true; bereft of any doubt or skepticism. Typically used as an affirmative response in conversation.
1: You down to hit up that club later?
2: No doubt son, no doubt.
by als August 21, 2003
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Said usually by Jake Peralta in Brooklyn 99

This is used when in an awkward situation or in any situation really.
Person 1: " Hey we need to talk about us okay"
Person 2: "Cool, cool, cool, cool, cool. No doubt, no doubt, no doubt.”
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dont know wot it means but ask any townie
tom - "i run 14 miles a day"
jane - "doubt, massive doubt"
by poo July 30, 2004
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