A phrase in which "big men" from Texas (see George W. Bush) will use in defense of their state.
Little do they know that it was a slogan coined in the 1960s by Ladybird Johnson in a highway beautificatoin campaign. So when you hear some macho cowboy say this, what they mean is "Please dont litter in my state."
I'll mess with Texas all I want! I just won't defenestrate my garbage.