The act of having sex without a condom, especially with the singer-songwriter Jewel.
Etymology: Jewel's 1998 poetry collection, A Night without Armor
Anthony Kiedis: How was the concert last night?
Flea: Sick. I hooked up with Jewel!
AK: Did you use a rubber?
Flea: Nah, dude, it was a night without armor.