Forgetting The Rule

Don't ask them questions
Straight after school
That's how it goes, the unwritten rule
I usually abide
As this rule makes sense
But today I said it 
And got my comeuppance
Tell me three words to describe your day
Poo, fart, bum
You quickly say
Laughing and laughing you run down the road
The three words saying back off in 5 year old code.