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2.
A phrase tacked on to the end of a statement to imply that the information being given is simply a courtesy, when in reality there are specific expectations of you now that you have this information
What Danielle says to guy she's been seeing: Oh, hey I decativated my profile on the dating website, just so you know.

What Danielle REALLY means: You better take your dang profile off the dating website too....NOW!!!!
by Dwad!!!! June 29, 2010
 
1.
just want to let you know
just so you know, you are actually ugly like hell
by you&me May 31, 2006