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もふもふ mofumofu
So fluffy you have to touch it.
What does mofumofu mean?
The feel of fur or a blanket you want to bury your face in. It is onomatopoeia for touching something, not for hearing it.
Example
この毛布、もふもふで最高。
This blanket is so wonderfully fluffy.
Vibe
Who you can say this to, and how it lands.
Safe to use Fine in ordinary conversation.
The story behind mofumofu
Japanese has an enormous inventory of sound words, and they do not all describe sounds. Some describe textures, some describe moods, and もふもふ describes what your hands and face feel in thick fur. Nothing is audible. It is closely related to ふわふわ and もこもこ, and it seems to have surfaced online in the 2000s, riding the wave of pet photographs.
Because it is a sound word, it bends freely: もふる is a perfectly usable verb meaning to bury yourself in something fluffy, and もふもふしたい is a complete sentence, and a complete mood. Large dogs, small owls, sheep, alpacas and one very good blanket all qualify.