On Stenk is somewhat similar to its predecessor “on fleek” meaning of high fashion, perfection and looking fly. Other words are available.
On Stenk is used, most commonly, as a way to describe someone’s physical appearance and/or outfit when they are fully rocking a top quality look and you can’t just not comment.

For example:

Jon: were you at the wedding of the year?

Hannah: James and Claire? Yes.

Helen: Claire was fully on stenk!

Keith: RETWEET!
by Rathgam December 15, 2020
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Oh no the stonks market is down this stinks
worker: hey we are booming with company!!
worker 2: yeh
stonks man: oh noes stonks market is crashing
worker: can we call it stenks now
by backwards_cones March 3, 2021
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