judging by 13 of the top 20 definitions, it's a way to describe someone's eyebrows
OMG Abraham Lincoln's eyebrows are on fleek!
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When something is perfect, or going right, or on point
Person 1: Wow, look at Lee Pace's eyebrows!
Person 2: Eyebrows on fleek.
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Flawless Letting Everyone Else Know
You are fleek with them eyebrows girl
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lookin good originaly used to represent good shaped eyebrows
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v. to sing the song of one's people in a traditional manner, usually while dressed in ancient garments.
You have never heard the national anthem of Estonia? Then allow me to fleek.
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