ぴしゃり
pishari

To-Adverb

1. slapping; splashing; splatting; banging shut; flat (refusal, denial, etc.)

Onomatopoeia
かれ無礼 ぶれい返事 へんじ彼女 かのじょはかっとなって かれ かおをぴしゃりとたたいた。
kareno burēna henjini kanojowa katto natte kareno kaō pisharito tataita.
His rude reply provoked her to slap him on the face.
Other forms: