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
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 4, 2010
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 2, 2006
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 17, 2013
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
A word or phrase used by Drake and all other Canadians (from British decent) to ask for understanding at the end of a statement.
More chime for ya head top ya know.

That chick is a thot ya know.

I'm drunk as fuck ya know.
by SNATCH SLAYER 5000 March 26, 2019