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Someone who is overly proud of small accomplishments.
A braggart, but generally a great person who just likes to boast.

Also, could be considered a slang term for something so outrageous, silly, and/or trivial all you can do is chant:
"UNIcorn PRIN-CESS!!!!" and raise the roof.
"Can you believe I got that working in-game before you did? I can, booyah! It's cause I'm a UNICORN PRINCESS!!!"
by Gardenia Glow September 12, 2006
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