Syncere Share definition Flag Syncere is a very gnarly person that likes to party and is quick to fuck your bitch if you mistreat her . Boy:Bro wtf some dude just kissed my girl and walked off . Friend: It was syncere . Syncere by SosyncereFr March 13, 2017 0 0 Get merch Get the Syncere mug. Buy Now — $32.95 See more merch