7-12-9er Share definition Flag A trilogy of numbers that are spoken at random moments to lighten up the mood. "Dude my grandma died to day." "Ehhhhhhh 7-12-9er!" 7-12-9er by Brownie April 21, 2004 0 0 Get merch Get the 7-12-9er mug. Buy Now — $32.95 See more merch