Deep Funk

Profound sadness or even depression, especially when caused by a disappointing mistake. It was coined by the chess world champion Magnus Carlsen after loosing against Daniil Dubov because of a clamorous error leading to a quick mate.

"Loosing like this is frustrating, I'm on a deep funk." -Magnus Carlsen on Twitter
"I solved the whole problem all good but then I went 3x3 = 6 and I'm on a deep funk right now."
"I've been in a deep funk since my hamster died because I left the door open and let the cat in."

deep funk

Meaning very good (feel, taste , smell, etc)

This sushi is deep funk