From Team Fortress Wiki

“

— The Heavy on large chunks of fun summer metal bolted through his flesh My flesh, it burns! ”

The Big Steel Jaw of Summer Fun is a community-created cosmetic item for the Heavy. It is a large metal jaw with a variety of crooked metal teeth, which is bolted onto the Heavy's head and covers his mouth.

July 1, 2011 Patch (Summer Camp Sale)

The Big Steel Jaw of Summer Fun was added to the game.

July 12, 2011 [Item schema update]

The Big Steel Jaw of Summer Fun can now be used in crafting.

July 18, 2011 Patch

The Big Steel Jaw of Summer Fun can now be crafted.

Trivia