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1.
The portion of a Wikipedia entry above the 'Contents' box.
Bob: What the heck is a 'shaka'?
Joe: I don't know. Did you read the cliff notes?
Bob: Joe, are you high? There's no cliff notes for hand signals.
Joe: I am high, but you can get the cliff notes for anything by reading whatever is above the 'Contents' box for its Wikipedia entry.
Bob: o_O
Joe: The more you know, Bob. The more you know.
by bigbeard January 26, 2013
 
2.
"I got the cliffnotes." noun. Used to brush people off during a potentially long-winded story or explanation of current events.
When someone is talking or telling you a story and you don't want to hear it, say "Thanks but I have the cliffnotes," to shut them up. This works in many ways, like if someone asks if you've seen a movie, etc., you can say you have the cliffnotes (to the movie). You can experiment and enjoy pissing people off.
by mike viviano June 13, 2007