(computing) a notebook computer

having served one's purpose

use (noun) / a task, business, an errand

be useful, serve / be valid, be usable (e.g. a coupon at a cash register)

notebook

to take a note, to write something down

(computing) Clipping of パーソナルコンピューター (pāsonaru konpyūtā, “personal computer”); a PC

毛舌: black hairy tongue

毛氈: felt

Said when reflecting on something remarkable.