It's a [WET extension to jQuery](https://github.com/wet-boew/wet-boew/blob/d57cf9b7e14dc8d0015e9dbba0e32e14d1842bc1/src/core/helpers.js#L194-L203) that allows us to execute helper funtions on jQuery objects.  In this case I'm using it to execute the [toggle helper](https://github.com/wet-boew/wet-boew/blob/d57cf9b7e14dc8d0015e9dbba0e32e14d1842bc1/src/core/helpers.js#L187-L191).