I used to not be able to stand it when people said "like" all the time, but I've mellowed out. Now it's "you know what I'm sayin'."
"And we, you know what I'm sayin, we went to the beach, know what I'm sayin, and then they had this you know what I'm sayin, great big, you know what I'm sayin, it was like a, you know what I'm sayin, shit, I don't know, you know what I'm sayin..."
That and people who say "listen" before they say something. I'd like to crack their heads and the "know what I'm sayin" heads together.
http://www.youtube.com/watch?v=MfIsamoNwGk
http://www.youtube.com/watch?v=FoWnIhDuW4g