jackbag
A bag or container that someone uses to dump their jizz in. It’s also a bad name to call someone.
My friend’s jackbag is just a sock he uses to catch his jizz. It smells like old pizza.
My brother called me a jackbag because I got caught eating pizza in the library.
My mom says I’m a jackbag because I used my sister’s backpack as a jackbag.