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Random
An individual who brags/gloats about items for which there is no manner of validation - usually via social media.
Joe was shadow gloating about house hunting, erstwhile he lives with his parents, has a low paying job and has no hope of ever buying a home.
Someone who is a substancial annoyance to you, either through their stupid actions or unpleasant personality.
Seriously, she did that? What a buttwagger!