S.I.L.F Share definition Flag Sheep I'd Like to Fuck sheep shagger} - A common welshism/bristolian term, often quoted whilst at the local farmers market. 'Cooor, that there Black Mountains a bee-uty!' 'Aye, she's a right S.I.L.F' S.I.L.F by PoL, Gas, Cymraeg. July 3, 2008 0 0 Get merch Get the S.I.L.F mug. Buy Now — $32.95 See more merch