Backseat spelling Share definition Flag Someone who always corrects your spelling on MSN or some other IM program. User 1: That bich is fly. User 2: Bitch* User 1: Quit backseat spelling asshole. Backseat spelling by Platinum Bullet January 2, 2009 0 0 Get merch Get the Backseat spelling mug. Buy Now — $32.95 See more merch