When I was a school child, and later a teenager, the term "goosed" someone (where I was from) meant you walked up behind someone and using both hands, on both sides simultaneously, poked them in the ribs, pretty high up under their arms. It was unpleasant, sometimes painful, it startled, it was supposed to "tickle" and usually made the person jump and screech.
Frequently in our violent little world, the assaulted person would turn around and attempt to knock the daylights out of the "gooser." Which is why almost 100% of the time it was something done by a boy, very rarely to another boy, but to a girl, or perhaps a smaller weaker child of either sex. In short, it was harassment, and was intended to be, not just a fun little exercise in striking up a conversation or stirring up the atmosphere of the break room.
I asked others, and found that in some other parts of the country, people said that a "goose" involved a finger poke to the crack of the butt, which is REALLY inappropriate. (And where I'm from would've probably have led to a killing!) In any case it was always a form of bullying or torture or harassment. Either way, if this person thought this was by any stretch an okay thing to do to another person of either sex in a work situation, he's obviously at best a complete idiot, at worst a really bad sexual harasser.
It will be interesting to see if this was a one time incident, or if there had been prior bad acts that maybe not everyone in this picture knows about. He is being portrayed very innocently here by his wife, who will not be the one speaking for him in the court about what happened. And this person's husband really needs an attorney, regardless.