。
She slapped me across the jaw.
Literal
She [topic-は] my jaw [object-を] slapped-hard.
ひっぱたく is an emphatic, vivid verb for slapping — formed from 引く ('pull') + たたく ('hit') with the doubled consonant ひっ adding force. Stronger than just たたく (tap, hit) and far more colloquial than 殴る ('punch, strike'). The 顎 ('jaw, chin') is an unusual target — striking someone's jaw is more aggressive than the more common 頬 ('cheek') of stage slaps. The body part takes を, in line with the broader Japanese pattern where body parts are direct objects of the action (顔を見る, 肩をたたく). The whole sentence has a punchy, slightly cartoon-violence feel — a sharp single moment captured in plain past tense.