Something for the weekend?

My teeth were laughing, now
We couldn't stop smiling
We danced to the Mystery Band
Without even trying
My eyes were half open
But we didn't see them there
We ran along, walking 'cross the roof-tops
In my chair

Rossi/Young

Waiting for my fortnightly crewcut, I didn't quite understand what the phrase meant as I sat in the chair watching the grown ups being shawn.. Being small I had to sit on a small plank of wood that was stretched strategically across the arms of the barbers chair.
It wasn't so much loosing the locks, it was at the end when the barber insisted in swamping my head in some diabolical lotion and then attempting to remove my head from my shoulders as he massaged it into my scalp. I didn't get why he would ask the grown ups if "they wanted anything on it" but would just drown me in the stuff. He never got around to asking me "if I wanted something for the weekend"?, either.