adverb, adverb taking the 'to' particle
vigorously; briskly; boisterously
Describes doing something with energetic, rough, or forceful movements, often with a sense of noisiness or lack of restraint. Common in casual contexts.
彼はガシガシと頭をかいた。
He scratched his head vigorously.
子供たちがガシガシ遊んでいる。
The children are playing boisterously.
He ate his meal vigorously.
He scratched his head vigorously with a troubled look.
I roughly filed down the surface of the wood to shape it.
When I was young, I used to work vigorously.
Katakana is the most common written form for this onomatopoeic adverb.
Hiragana spelling is also used, though less common than katakana.
Onomatopoeic word mimicking the sound or feeling of rough, energetic movement. The exact origin is uncertain.