Clagg Share definition Flag 1:To latch on to a surface with solely the use of friction. 2: To remain attached to a surface without the use of hand or foot holds. The man had to clagg to the smooth stone inorder to remain out of the the molten magma. Clagg by Schlaubskins II October 29, 2021 0 0 Get merch Get the Clagg mug. Buy Now — $32.95 See more merch