Meaning of “Shu-tto shiteru(シュッとしてる)”

“Shu-tto shiteru(シュッとしてる)” means slender and cool-looking kind of…
“Shu(シュッ)” is an onomatopoeia that, to me, evokes the image of a refreshing breeze quickly passing through.
It’s really hard to explain the nuance of onomatopoeia…

Anyway, “Shu-tto shiteru(シュッとしてる)” is a compliment. If someone says it to you, take it as a good thing and be happy!

Example Conversation

A: How’s the new hire at your place?
B: They all “Shu-tto shiteru(シュッとしてる)”, I feel.

A: お前のところの新人、どんな感じ？
B: なんかみんなシュッとしてるわぁ