Jam Jars Share definition Flag Large glasses with thick lenses, often considered nerdy or geeky. Sometimes referred to as coke bottles. Cool Kid 1: Eugh, look at that dweeb with the jam jars. Cool Kid 2: Gag me. I wouldn't be caught dead wearing those. Jam Jars by Raoul D. October 4, 2010 Get the Jam Jars mug.