When asked what they think "Don't Mess with Texas" means, people I meet "up north" generally translate it into something along the lines of: "Texans are haahhd, so don't fuck with us, or we will mess you up." AKA, I'm talkin' about steppin' off.
They're usually shocked when I tell them it comes from an anti-litter campaign. I even saw someone with a shirt that said "Let's Mess with Texas!" It's true: northern hipsters have started a pro-littering campaign.
Why would you want to make this Indian cry?