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To act petty, childish, or immature; to act in such a matter as to end friendships on a whim, with the inevitable result of socially isolating oneself.
Sitting at a dinner table with a group of friends, one friend (named Ken, perhaps) refuses to talk with his former good friend, (Simon, for example). You say, "Ken, quit being so damned kylish and talk to Simon!"
by Anonymous Penn Stater September 03, 2006
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