The term is commonly used at the end of a statement, primarily to emphasize the factual basis of said statement.
It can also be used to educate others of your self-importance or emphasize others' faults.
The term was popularized by Allison Dubois on an episode of the reality show "The Real Housewives of Beverly Hills - Dinner Party from Hell."
Allison: "I have books written on me and by me and television shows based on my life so you can just take a flying leap. Know that."
-or-
Jason: "You're an uneducated silly bitch. Know that."
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