Coined by the Chinese internet users recently to describe the feeling that something is not as good as expected and not giving you the "YES! THIS IS IT!" moment.
the stem of the adj. "geli" is what this word in Chinese sounds like. Geli literally means to use strength. Like a girl would say "fxxx me harder" during sex. I personally think that's one connotation in it.
A: This party is gonna be WILD.
B: I KNOW!
When they arrive and the party sucks.
A: This is so ungelivable.