There is no true definition. The word is only used by the master of masters. Although the word phrase has lots its translation and true meaning during the time of the medieval ages, some believe that it means to know "what is best". If someone were to make a wise choice, then another party would exclaim that this person "knew his/her goods" in that specific area.
Know ya goods for trying to act like the master

KNOW YA GOOODS!
by padawantobemaster July 22, 2010
Get a know ya goods mug for your cat Manafort.
When someone who you have met on several previous occasions acts like they don't know you when they see you in a different setting.
Susie: Hey, isn't that Joe from shipping who just walked past our table? He didn't even say, "Hello". I just talked to him earlier today!
Jenny: Yeah...he's got a case of the 'Don't Know Ya's.
by Likely March 03, 2010
Get the a case of the 'don't know ya's neck gaiter and mug.
Phrase stuck onto the end of almost every sentence in East London's black community. Similair to ya get me? it is a probing to see if what is being said is being understood.
"You best pay up ya know"
by royale male April 02, 2006
Get a ya know mug for your Facebook friend Paul.
1)A phrase said by an individual who doesn't know exactly what to say to a question.

2)A phrase said by an individual that can be said after any statement whatsoever in order to form a question of acknowledgment, and it tends to always fit in with the statement.
1) "What time is Betty coming over tonight?"
"Oh, ya know.."

2)"This house gets really scary at night, ya know?"
"Bob's wife is a bit senile these days, ya know?"
by Tom and Cameron February 18, 2006
Get a ya know mug for your barber Jerry.
1. An answer to questions that most people will understand and offer their concencus; usually trails off to allow for some exchanging of looks

2. Can be used when you just don't know how to answer a question

3. A phrase that is often used to answer questions, even when the inquirer may NOT know; often results in strange, confused looks and/or annoyed glares, especially when answering a question that no one could POSSIBLY know the answer to
Guy 1: Man, that girl sure is hot, huh?
Guy 2: Ya know...
Guy 1: *nods in agreement*
(exchange looks of mutual understanding)

OR

Guy 1: So, how do you think you did on the Physics test last period?
Guy 2: Ya know...
Guy 1: *nods in agreement, then realizes "wait...how could I POSSIBLY know that??" looks befuddled and walks away, annoyed*
by samantha-fantha February 16, 2013
Get a ya know mug for your fish Sarah.
The perfect thing to say when you haven't been listening to a conversation that you started. This works for an answer to virtually any question. Perfect for answering if you can't hear the speaker in a crowded, loud room.
Friend: "So how've you been lately? Any better?"
You: "WHAT?"
Friend: "I said, HOW'VE YOU BEEN?"
You: (panicking) "Oh, uh...I don't know, man, it's just like...I don't know, ya know?"
Friend: "Yeah, totally."
by BFFLUWDTWBBFFLIHOTOP February 19, 2010
Get the I Don't Know, Man, It's Just Like...I Don't Know, Ya Know? neck gaiter and mug.