mayonase Share definition Flag The incorrect way to spell mayonnaise. This spelling of mayonnaise is often used by utter morons. <Dude> dude I need some mayonase <Bro> It's spelled "mayonnaise"... <Dude> idc i need some either way mayonase by GrizzlyWordinator July 1, 2009 0 0 Get merch Get the mayonase mug. Buy Now — $32.95 See more merch