！、！
Who are you calling a tsundere?! At the very least, I don't remember doing anything 'dere'!
Literal
Who [subject-が] tsundere [question-か](emphatic-っ)! At-least dere [and-such-とか], done memory [dismissive-なんか] not-exist [feminine-わ][assertive-よ](emphatic-っ)!
ツンデレ is a blend of ツンツン (prickly/aloof) and デレデレ (lovey-dovey), naming the anime/manga archetype of a character who acts cold but is secretly affectionate. The speaker is protesting the label by denying having done the 'dere' half. The final flurry — ~わよっ — stacks feminine わ with assertive よ and a small 促音 っ (glottal-stop clipping) for emphatic, frustrated delivery. ~なんか tags the noun dismissively, and ~た覚えがない is the fixed 'I don't remember ever doing X' pattern.