ガクガクブルブル (がくがくぶるぶる) Japanese meaning | KotomoraMeanings
1
adverb taking the 'to' particle, noun or participle which takes 'suru'
chattering teeth and trembling with fear
onomatopoeic or mimetic word
Vivid mimetic expression combining ガクガク (chattering) and ブルブル (trembling), often used when someone is extremely cold or terrified.
See also: ガクガク · ブルブル
I watched a horror movie and was shaking with fear.