mfr1 Share definition Flag The mayfair section of Philadelphia. Usually shortened to "mfr1" for use on facebook, through texting, etc. Status update on facebook: mfr1 tonight, comeup! mfr1 by EmiCake November 8, 2010 0 0 Get merch Get the mfr1 mug. Buy Now — $32.95 See more merch
