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As explained by Kevin...

When the tingle of yummy hits the back of your throat and makes you smile a little.
Z: Kev, what's the smile for?
Kev: That jelly cookie gave me a surge of yumminess <with a grin>
Sean: My gordita gives me a surge of yumminess all the time <with a BIG grin>
by His Roylal Throbness August 05, 2005