If it's my home game and someone says that, it's T7000. Someone could easily angle it a different way since it is vague, but to me they are clearly doubling the active bet. If they want to debate it, I'll hear them out, and then probably ask them to be more clear in the future. There is definitive denotation and connotation when words are said. In our social situation, it's clear what's happening. And people angling would get away with it once, but might not be invited back.
People in my game say all sorts of things, such as some will say "baby bump," which means the minimum raise possible, etc. Sometimes people in my game will say "more" and that means it's a raise, and it's binding too. We all understand how words work. I'm not trying to have legal/technicality battles with people in my home.
In a casino, if I was in the hand actively and it was now my turn to act, I'd ask for clarification, but let the dealer decide what happens. I don't usually act until the chips make it in the pot.