f3cking Share definition Flag F3cking, or fecking, Is a 1337 word, used to replace the common profanity, fucking. Most often used as an emphasis on self praise: "I am teh f3cking 1337est!11one!!1 f3cking by TheLameSauce January 28, 2005 0 0 Get merch Get the f3cking mug. Buy Now — $32.95 See more merch