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1.
A filler word, inserted in oral speech. Similar words include like, just and and stuff.
I'm not very good at public speaking, y'know. Like I get nervous y'know.
by Exit Ramp June 20, 2004
 
2.
In southern regions, a conjunction of the words 'you' and 'know' - typically used either at the beginning of a sentence when either stating a fact or opinion, or to begin a question. Also used at the end of a sentence, when looking for confirmation that the listener understands or agrees with the statement.
"Y'know, I was going to fix that truck this weekend"
"Y'know how to get to i95 from here?"
"People in this world have gone crazy, y'know?"
by prophiseer October 28, 2006
 
3.
A filler-word used in speech, especially when one is nervous. Used often by guitarist Billie Joe Armstrong in interviews.

Can be replaced with like, and stuff, um and sorta.
Time Magazine: 'How do you respond to people who say that Green Day isn't punk anymore? Have you changed your style in response to naysayers?'

Billie Joe Armstrong: 'The thing about any genre of music, if it's punk, if it's blues or jazz, there's... y'know or straight up rock n' roll...'
by jammiedodger546 January 01, 2012
 
4.
A Euphemism for masturbation.
When was the last time you uhhh... yknow
by dhdfkjoicjkm March 07, 2009
 
5.
Verbal method of denoting an opening parenthesis, whether reading aloud from a printed source or simply clarifying the punctuation of your own thoughts.
For usage of y' know, see the example at n' stuff.
by Jose Jarrell August 30, 2005