To not wear underwear with pants. Named so because your junk is going in alone, and without support, much like a commando.
John is going commando biking to prevent chaffing.
Someone who remains sober, or gets less intoxicated then other members of a party during the comsumption og alcholic (spirits) beverages. Designated so to provide guidiance and keep everyone else from getting into trouble, ie arrested, hooking up with a ex or an ugly person.
Person 1:" yo bro, why you getting so wasted, your suppose to be my spirits guide tonight."
Person 2: "sorry bra, looks like your taking this spirits quest alone."