Fossle Share definition Flag To surreptitiously scratch your testicles through trouser pockets. Not to be confused with surreptitious wanking. "What's up Fred, you lookin' for change?" " Nah mate, just 'avin a good fossle!" Fossle by Mark Tarr February 11, 2009 0 0 Get merch Get the Fossle mug. Buy Now — $32.95 See more merch