Mostly
Irish expression for: "stop being an idiot" or "act more maturely"...
literally: "act more wisely". Typically
said in a scolding manner.
1. "god you look soooooo
hot in that
tight top..." "Hey you know I have a
boyfriend, wise up."
2. "Stop acting like such a clown, it's a sophisticated party and they aren't impressed so wise up."