soykaf Share definition Flag Like coffee, but shitty and made from soybeans. On lainchan (a cyberpunk-themed image board) it is the word filter for "shit." Mountain Dew tastes like soykaf—ick! soykaf by lainon December 6, 2020 0 0 Get merch Get the soykaf mug. Buy Now — $32.95 See more merch