When you don't shave your scrotum for a couple days and it becomes prickly stabbing your genital area like a knife, making you want to cut your balls off, and cry endlessly in a dark corner. It pretty much feels like a small cactus in your pants.
A common name for large thickets of blackberry bushes. Often thought of as a pest, these bushes grow quickly and engulf trees, barns, and abandoned houses. They have annoying prickles that will catch on your clothing, and give you shallow cuts on unprotected arms and legs.