[b]From Urban Dictionary:[/b]

[i][indent]A fuck boi is that one 15 year old boy you have on facebook who posts selfies of himself pouting with more than one filter applied over the picture and gets way more like than he deserves.

Typically fuck bois have gelled quiffs, think that it is acceptable for a boy to pout in photos and frequently post selfies with their 'six pack' in full display.

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[url=http://www.urbandictionary.com/define.php?term=fuck+boi]Source[/url]