Stay Frosty t-shirt

In the Marine Corps, “Stay Frosty” basically means “keep your cool,” but said in a way that makes you sound like a tactical action hero instead of a sweaty, sleep-deprived human being. It’s the Corps’ way of telling you to stay alert, stay sharp, and preferably avoid doing anything that will make the platoon sergeant materialize out of thin air to yell at you.

In practice, it usually translates to: “Pay attention, don’t panic, and please stop touching buttons you shouldn’t.”