"This girl is so depressing." "Yo, don’t worry about it."
Gloom pottery is... well, it's gloomy. And it puts me in a gloomy mood. It's depressing, really!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Be careful of the shortening, and don't be tricked by the hiragana sticking out. The readings of the kanji don't change.