What is Svelt?
1.
Slim and trim, like the young
"What's all the comotion about?" said the svelt young Prince of Town.
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2.
The word is actually spelled 'svelte' and is documented in (non-urban) dictionaries.
It means: Slender or graceful in figure or outline; slim.
"Check out Julie, she's looking svelte today"
"Look at Sarah in that purple dress, she looks like a svelte Grimace" (as in the McDonalds character, not the facial expression)
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3.
Pronouced Suh-velt. Super sweet and/or cool.
John: I found $20 on the floor!
Mary: Svelt!