Don't know how to act 

When something (an environment or event) gets you so excited that you do something outrageous in reaction. Origin is possibly from the Flo Rida song of the same name.

"Look at you - first 50 degree day after winter and you aren't wearing a jacket - you don't know how to act..."

Don't know how to act by charlesgriffingibson April 7, 2014

It's for me to know and you to find out 

Mind your own fucking business.

You:Heeey , who did you talk to last night?
Hot Girl:It's for me to know and you to find out

It's for me to know and you to find out by ThaChingsteeeeerr September 11, 2010

you know what i'm sayin

A frequently used phrase among slack jawed rappers.
(I've never met one that wasn't slack jawed)
Due to the fact that they can't communicate well because of the stupidity of ebonics.

It is primarily used to ask if the recipient of a statement understands what was being spoken. It is necessity to ask this because rappers are to stupid to ask what the speaker meant when they couldn't understand the statement.

you know what i'm sayin homie DUH!!!

you know what i'm sayin by RAPSUCKS1738 November 17, 2006

you don't know 

An almost sarcastic response to something so seemingly simple you shouldn't have to ask the question to begin with. Could also be an affectionate term meaning again that the answer should be obvious but you just missed it. It is said so quickly, it almost sounds like one long word.

"He's owes me money that's why you haven't seen him. You don't know? He better not come around here".

Guy to his girl "I love you shorty, you don't know?"

you don't know by Isis4aday May 20, 2008

i'm sexy and i know it 

A song people made while on drugs but became a huge hit. It's gay as fuck.

Person 1: Have you heard the song 'I'm Sexy and I Know It'?

Person 2: Say that one more time and I swear to fucking god I will kill you

i'm sexy and i know it by OreoLover20 May 30, 2016

ya done know! 

that's right!!!

did you kick that guyz ass that was trying to chop your girl? ANSWER: Ya done know!

ya done know! by Robinson January 30, 2004

don't know 

when you have nothing to say

"I don't know"

don't know by JOHNSON II October 16, 2003