It's commonly used when you pick up a radio on a public band.
So if you have a jobsite where there are 100 radios, and someone needs to reach Ted, they'll page the radio and say something like "Hey Ted, do you copy?" and Ted will respond with "Go for Ted," which means yes, Ted is here and he's listening, go ahead.
It was used in a small way some 40 years ago and never really caught on.
“Go for X” was somewhat common, including in media. I think OP was mishearing that. There’s virtually no way to differentiate between “gopher” and a rushed, casual “go for” in speech.
I don't think I've ever heard someone say that at the start of a phone call but it's common when communicating with two-way radios like:
"Alex for John, over"
"Go for John, over"
"<whatever Alex needs to say to John>"
I mostly heard that when working in large retail stores, usually the walkie talkies have an end-transmission sound que so we didn't actually have to say 'over' at the end
It's our national rodent and I'll thank you to take appropriate pride in her. Squeeker squeek.
I think they're saying "go for John". I saw it on a movie once and thought "huh" and my buddy Chris did it a couple times, but that's about all my IRL experience with it.
American here, and I’ve never heard anyone seriously answer the phone this way. I did have a co-worker who would answer “Go for Mike” as a joke when he knew the caller. I had the impression it was from silly comedy or sit-com or meme that went around for a while.
Maybe this is related: when I did a huge remodeling construction job for a summer as an unskilled laborer, I basically ran around and helped different people on everything. That's sometimes called being a "go-fer boy". "Go for this, go for that" meaning I would always run around and fetch tools and do simple tasks.
Pretty sure it's an old businessman thing. "Go for (my name)!" in a cock-sure tone is pretty much how I would expect any old business hot-shot asshole to answer the phone.
We would say, "go for (name)" at work over the handheld radio, never heard of anyone using this on the phone. Sometimes I'd get bored and say "go for Zap Rowsdower" or whatever
It’s uncommon, I’ve heard it used every once in a blue moon like Barney Stinson (HIMYM) answering his phone and I haven’t seen a definitive answer other than indicating to the caller that he, Barney, is the one answering the phone.
This question has plagued my mind for decades, because the main character of the tv show Eureka, Jack Carter, always answered his radio/phone with this. And to this day I have no idea what words he was saying or why he always said it. I had started to think he was saying "gofer" which is
An employee who runs errands in addition to performing regular duties.
But that seemed a bit weird for the sheriff to say