A person who brags about being somehow involved in a major event, even though they themselves had absolutely no effect on it what so ever.
Teacher: Does anyone want to share a story about 9/11?
Jimmay: O! I have a story! My great aunts 3rd cousin's grandma's dads best friend had a friend who was 5 miles away from it when it happened!
Teacher: Wow. Ok.... Anyone else?
Timmay: jeez Jimmay dont be such a no-need-exagerator! Its really annoying!!