I just thought you should know... 

Did the teacher forget to assign homework?

Was your neighbor complaining about overgrown hedges?

I just thought you should know(IJTYSK) will ALWAYS be there to relay these messages!

IJTYSK is typically used as a preceding comment, meant to soften the blow of inevitable bad news.

Usage of IJTYSK as a trailing comment is not uncommon, thought more in line with southern classic "Bless your heart"

"Class dismissed!"

"I just thought you should know...you didn't assign weekend homework"

"I just finished my first 5k!"

"I just thought you should know...over 5 million people run a 5k at least once a month."

"This restaurant is great, the owner is so friendly."

"I just thought you should know...he doesn't pay his taxes and cheats on his wife."

"I just made an entry in to the Urban Dictionary!"

"I just thought you should know...anybody can add anything to Urban Dictionary, it's not an accomplishment. It's like bragging that you got accepted to Facebook."

I just thought you should know... by Jack from Sacramento September 7, 2018

i dont know you from atom 

not knowing someone at all - to be more precise, not knowing someone even at the very infinitesimal atomic level.

"yo brah whuh chu jarking?"

Shit man, i dont know you from atom

i dont know you from atom by Jar-King March 30, 2010

You wanna know how I know your gay?  

used to make someone aware that they are about to be told why they are gay. Used several times in a popular movie starring Steve Carrell called 40 Year Old Virgin

Bob: You wanna know how I know your gay?
Callum: How?
Bob: Because you got a tent when playing rugby in sports lessons . . .

You wanna know how I know your gay? by arsenalman December 15, 2008

I didn't know you were Emo 

When in a state of utter failure or just feeling like crap, rubbing your hand across your wrist like your cutting it and as a joke someone anouncing that you are now emo.

Bob: *air cutting*
Bobby: "Geez, I didn't know you were emo!"

I didn't know you were Emo by Carteloise July 18, 2009

i would like to get to know you better 

Basic you got rejected....they don’t get a shit about you there just saying that to be nice

((Me)):this is kind of hard to say but I love you
((Damn hot guy )): that’s cool your chill 😂
((Me): damn
((Damn hot guy)): I sorry I don’t like you in that you tho, I would like to get to know you better

i would like to get to know you better by Bored vjugnk November 5, 2017

I know you are but what am I 

A great comeback or a phrase that will wreak havoc. This phrase and be used to simply annoy someone or to say for the heck of it.Also it can be used in a conversation.

1)Ruben:Your a butt cheek

Tom:I know you are but what am I?

2)BOB:I'm going to be Albert Einstein

Rick:I know you are but what am I?
BOB:Beats me it's up to you

I know you are but what am I by Alejandro The Great YouTube March 30, 2017

You aint know! 

You already know. As in a confirmation of the previous statement. Kind of a double meaning with "You didn't know"

Cecy: You love me?
Mane: You aint know!
Cecy: Already
Mane: Fo Sho. Always.

You aint know! by Cecilia Zuniga October 18, 2007