play (the) wag
To absent oneself or leave early from school or work when one would normally be required to be there. Primarily heard in UK. I was so restless and bored at work that I decided to play the wag after lunch. Hey, Jim and I are playing wag from school on Friday, do you want to come with us? That's the last time you play wag, mister! From now on, I'm dropping you to school every morning!