1. Eyewear retainers worn by dads, even though they aren’t near deep water or the backcountry (e.g. full-time Croakies)

2. The back strap of one’s sunglasses, used as a chick magnet. (It does not, in fact, attract chicks.)
Hey, Dad! Your goomba strap is a little crooked.

“Hide your woman! That man is wearing a goomba strap!”
Get the goomba strap mug.