An onomatopoeic adverb describing a small, light, bouncing movement or a quick pop-up/pop-down action; often used for brief gestures like a small bow or a hop.
彼はぴょこんと頭を下げて短く挨拶した。
He gave a quick little bow and greeted briefly.
子猫がぴょこんと跳ねてソファの上に乗った。
The kitten hopped up onto the sofa with a little bounce.
花が土の間からぴょこんと顔を出した。
A flower popped up from the soil.