Loose Shifter Share definition Flag One who presses too lightly on the "Shift" key, thereby causing breaks in strings of exclamation/question marks. Loose Shifter: THATS SO COOL!!111!!!!1 Annoyed Person: You are such a loose shifter. Loose Shifter by Anonymous October 5, 2003 0 0 Get merch Get the Loose Shifter mug. Buy Now — $32.95 See more merch