To have smarts/be smart, but usually not in a knowing calculus at the age of 6 smart, but just being aware and making smart choices. Mostly known for "Keep your wits about you." quote from several films,games and media that date back in the days(medieval etc). Meaning just keep your head up and be smart about what you do, be careful.
Malik decided to get piss drunk right before finals and didn't even study, he failed the test the next day, he sure as hell didn't keep his wits about him.
Take this sharp stick, it's all I have to give you before you venture off onto your jourey... but with just a stick, be sure to keep your wits about you, Sir Mark.
What is this shit? Used liberally in the military for staff work that is poor in quality or annoying from another person.
I sent the Captain the report from the IG and he scrawled "WITS" all over the front