Comes from the word yumejoshi (dreaming girl). It refers to people who self-insert to imagine themselves in a relationship (doesn't have to be romantic) with a fictional character, either by creating a self-insert sona or just an original character not meant to be themselves.
It can also be referred to as self-shipping.
"I yume with Miguel O'hara."
"I yumeship with Ganyu from Genshin Impact!"
"I'm sorry, but i don't like sharing my yume."
An addiction to a Video Game.
I think i have a yume to Minecraft.
a famous legendary black samurai from tanzania in the sengoku period
His famous battlecry was his own name
"Yume mibas was known for his sword technique: bas-ing"
"YUME MIBASSSS!!!" (his famous battlecry)
An LSD dream simulator about cats.
"after playing Neko Yume, I got nightmares for days"