crotch glow

The act of holding one's cell phone low in your lap as to conceal your actions, all the while illuminating yourself from below.

When people play on their phones during Spanish class. If other kids want to call eachother out on it, they will say "Is that a glowing crotch?" Many people will find it hilarious and disgusting if you refer to phones this way. Indeed, a spanish teacher once said "Stop staring at your crotch and smiling, while poking it." They hide the phone under the legs near the crotch, so that teachers can't see it, and its glowing, so it gets the name "Glowing crotch"