adverb
repeatedly; thoroughly; briskly
Mimetic adverb describing doing something over and over without pause, or moving quickly and lightly. Often used with verbs like 歩く or やる.
彼はスコスコ歩いて行った。
He walked off briskly.
仕事をスコスコ片付ける。
I get through work quickly and efficiently.
noun, noun or participle which takes 'suru'
Colloquial, onomatopoeic slang for male masturbation. Often used as a noun or with する.
彼は毎晩スコスコしているらしい。
Apparently he masturbates every night.