1. occurs when an individual is screwed over by someone he thought he could rely on in the most reprehensible of ways at the worst possible time, with the least possible warning. Generally occurs after the offending 'friend' has recently reassured you they would never do any such thing. The offending individual in a situation-loggie generally justifies his actions by claiming he has found happiness.

2. The situation that occurs when an individual is willing to sell out all his friends and various other commitments abruptly and with no warning for a girl he has never met. Can also be used to describe situations involving people who generally put their fledgling relationships before their friends instantaneously, regardless of if they've met the person yet or not.

A person or people that purposefully causes chaos or mischief within a group for the sake of entertainment.