1. Any part of sex in which faeces from one partner is found on the other, regardless of the technique. NOTE: the action of defecating on one's self may not be regarded as a "hot karl" but rather as "soiling yourself".
2. A form of assault in which the assailant procedes to fill a tube sock with his own faeces, ready to engage in fierce guerrilla.
2. Brandon is such a moron, let's hot-karl him after school today.