Soft and fluffy (pleasantly cushioned); an onomatopoeic word used for beds, bread, baked potatoes, cushions, etc.
新しいマットレスはふかふかでよく眠れる。
The new mattress is soft and fluffy; I sleep well on it.
焼きたてのパンはふかふかで美味しい。
Freshly baked bread is soft and fluffy and delicious.
クッションがふかふかして座り心地がいい。
The cushion is plush and comfortable to sit on.
犬の毛がふかふかで触ると癒される。
The dog's fur is fluffy and touching it is soothing.
Absent-mindedly; an archaic mimetic word describing a state of being inattentive or dazed.
彼は午後ずっとふかふかしていて仕事に集中できなかった。
He was absent-minded all afternoon and couldn't concentrate on his work.
授業中にふかふかしていたら先生に注意された。
I was absent-minded during class and the teacher scolded me.