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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."
Know That by fobulouswon March 3, 2011
Used when you want to say you agree with someone. Just a shortened 'you know it'. But know it doesn't sound as good :) Also spelled kno: tht, dat & dhat. or know: tht, dat & dhat. Pronounced "know dat"
Tyrone: Corey's girl got him on lock, he stay with her all day, every day.

Tori: Mhmm, know that. she won't let him go.
Know that by Tori-<3 November 7, 2010
to acknowledge ones words or actions, or to inform someone of their new discoveries
Michael-Did you really give her the Angry Dragon?
Ty-Know That!
Know That by thetyty December 14, 2010

Did you know that there's a tunnel under Ocean Blvd 

The ridiculously long name of Lana Del Rey's upcoming 9th studio album, out March 10, 2023.
Stream Lana's new song Did you know that there's a tunnel under Ocean Blvd!

You Know That, Right? 

A phrase that can be added on to the end of a statement to make it sound obvious-- implying that the other person is stupid if they didn't know the statement.
Frenemy: So, have you kicked him out yet?
Anne: No...?
Frenemy: What are you waiting for? He'll never change.
Anne: I'm not sure wha--
Frenemy: He's cheating on you, you know that, right?
Anne: Oh! Uh... yeah... I...I uh totally knew that...*cough cough*

I Know That's Right 

When you know exactly what someone is saying.
Man I'll be single forever, people play too much!
I know that's right, that's why I'm single too!