earth shattering

When something is so amazing that it changes your world. Another way of saying mind blowing, or fucking amazing.

Jeremy Lin's win streak is Earth Shattering!

joke flashback

When you're just sitting there and you think of a joke and start laughing. Everyone thinks you're laughing for no reason but really you just thought of something funny. Joke flashbacks can also occur when no one is around.

Ashok: "Hahahahahahah!"
Shan: "What you laughing at?"
Ashok: "Heheh, just had a joke flashback."

or

Ashok: "Hahahahahahahahahahaha!"
(Silence ensues)