Wacc is a term used to describe anything weird or out of the ordinary. It can also be used to describe anything cool or dank. Also can be spelled Waqqccc if the situation is just that wacc.
A cracka wacka is a weed whacker that is missing a crucial component such as the carburetor but will supposedly work if the missing part is installed. Usually it's sale price is $11 but can be negotiated with scrap copper and other recyclables.
Johnny: Dude, where the hell did you get thatpiece of shit? It's missing the rip cord. Does it even run?
Dave: Don't be talking shit about my cracka wacka. I negotiated this fine piece of machinery at Sunnvale Trailer Park for a bent up shopping cart and some scrap romex. It will run once I install the rip cord.