Oonsly Share definition Flag An adverb that is used to describe someone who is performing an action in an incredibly strange or unsettling way. Kaelah sprinted very oonsly in the park, many people were staring. Oonsly by theveryrealhaechan July 1, 2023 0 0 Get merch Get the Oonsly mug. Buy Now — $32.95 See more merch