to know anything off by heart 

To learn something and keep it in mind for a longer time.

Synonyms:
To memorize
To learn by heart

Andy knows that it isn't easy for him to know anything off by heart.

to know anything off by heart by SmokingSkull January 22, 2011

I know right? 

An arrogant idiom used by insecure people to pretend they already know whatever it is someone tells them.

Widely confused with a request for affirmation, the question "right" is an attempt to bully the other person.

The idiom demands that everyone agree that "I know" because there is nothing you can say the insecure "I know right" idiot does not already know, right?

There is a giizzly bear sneaking up behind you...

"I know right?"

I just discovered the answer to P=NP.

"I know right?"

I named my baby Mary. You are the first person I told.

"I know right?"

Your zipper is down.

"I know right?"

I know right? by Shmata Than July 7, 2017

you know it 

a euphemism: it is an indirect, quasi-sensible answer to any question.

Pamela: yo, Dolly have you seen "Final Destination 5" yet?

Dolly: you know it

you know it by JessieJackson124 November 14, 2012

yeen know 

you don't know

- can also be written as y33n know (your preference)

Darious: Man you hear that new soulja boy song, its so cold i almost had to pull up my pants.

De'shaun: Ah shit, yeen know.

yeen know by B-Hardinator May 18, 2009

And you know this man! 

The definite truth when speaking or talking

"...and you know this man" as BoogieWonder high fived his partner in da club

And you know this man! by Getrich83 December 13, 2003

I know, right?  

The stupidest saying in the entire world and so less cool than that's real. Also shortened to "right?" because the proles who chose to use this word and too lazy to use proper English.

Jack: Dude, I just got a 50 percent on my math quiz.

Jackie: I know, right?

Jack: Wait, what?

I know, right? by Carly Wild March 20, 2009