Mariederby Share definition Flag Another term for 69-ing. Because you are all up in the chicks mary and she is giving you derby. Me and that hot chick mariederbied for like 2 hours. I like to mariederby with my girl friend. Mariederby by Hangliding Squirrel January 2, 2009 0 0 Get merch Get the Mariederby mug. Buy Now — $32.95 See more merch