Also known as a hash hole, a doughnut joint is essentially a joint with a rolled-up hash snake delicately placed on a bed of flower, then wrapped so the hash sits in the middle of the joint, completely surrounded by the flower. The hash-filled joint hits like a monster and burns like an ash doughnut, with the hash melting into oil and seeping into the flower as it burns, leaving a hole in the center of the joint as it goes.