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It’s a stupid acronym for someone who thinks they’re perfect but are just a mess. It stands for funny, amazing, caring, try-hard, sarcastic, awesome, clever, from, London, and we love him (or her if they’re not a guy).
@jessica: 'Why is he still in the group chat? He’s a factsacflawlh!'
DM from my cousin: 'Your brother is a factsacflawlh. He talks too much.'
Teacher: 'This kid is a factsacflawlh. He gets good grades but still needs help.'