high sidity Share definition Flag a term meaning high society; someone who has or acts like they have alot of money and is better than most if not everyone else I don't want a high sidity boyfriend; I want someone who is down to earth. high sidity by J-Millz 138 September 12, 2006 0 0 Get merch Get the high sidity mug. Buy Now — $32.95 See more merch