When your significant other sees a roach in the bathroom and comes running into the bedroom pleading with you to slay the beast. You don't cower or pretend that you are sleeping, you grab a hammer or appropriate weaponry and kill it. You sir are a roach knight.
A joint that is comprised of the roaches of other joints. Makes for superb smokage. The roach that comes from the "roach joint" itself is a "grandfather roach", a bit of weed that has somehow survived two joints. Hence, a "grandfather joint" is in turn a joint rolled, comprised of grandfather roaches, and just a delight to smoke with your buddies.