Boston Flinch Share definition Flag Throwing a object at a person and if they flinch it results in them receiving a punch. " HEY CATCH JIM" *Jim flinches* *thrower punches Jim* "aww man not the Boston flinch" Boston Flinch by California Chunk September 19, 2011 0 0 Get merch Get the Boston Flinch mug. Buy Now — $32.95 See more merch
