William: I was just gonna say that it's Pluto, sir.
a phrase used to indicate that we refuse to defend a claim we've made---in other words, that we refuse to offer reasons that what we've said is true
PERSON-A: "You shouldn't hang out with her anymore."
PERSON-B: "After all she's done to help me? Wouldn't that be pretty mean and selfish of me?"
PERSON-A: "I'm *just saying*, you should quit hanging out with her."
Just Say NO
What is fed into kids minds at school in the early intermediate grades. It really doesn't work much in the fight against drugs, etc