Onseener Share definition Flag An Onseener is a person that reads your text but doesn't reply back, they leave you On seen and its frustrating to other people. Wow Jessica, You freakin "Onseener" reply back! Don't leave me On seen! Onseener by Crusty12 September 21, 2016 0 0 Get merch Get the Onseener mug. Buy Now — $32.95 See more merch
