adverb taking the 'to' particle
Describes something standing straight or extending flatly, often with と. Mimetic.
彼は背筋をぴっと伸ばした。
He straightened his back perfectly.
adverb taking the 'to' particle
sticking into; attaching quickly
Mimetic for a quick sticking or attaching motion. Often with と.
シールをぴっと貼った。
I stuck the sticker on quickly.