Blankey Yankee Share definition Flag An SO who steals all the blankeys, therefore deeming themselves a Blankey Yankee. 'I slept with Brenda last night, and let me tell you, she's a damn Blankey Yankee.' Blankey Yankee by Poop12345!@#$% April 11, 2016 0 0 Get merch Get the Blankey Yankee mug. Buy Now — $32.95 See more merch