People use colloquialisms sometimes to refer to God because he is like a friend to them, or a member of their family. As long as they are not blasphemous and the intention of the person is not disrespectful, I think these are fine. “The Man Upstairs” was used frequently in my family and I have other little nicknames of my own for Jesus or God (which I will not share here).
While some people find these to be a little disrespectful, there are others who feel closer to God or Jesus when using some friendly nicknames. I think to some degree it is cultural also - some cultures have humor as a very central part of daily life and some do not.
I grew up in an Irish family where there were many names for God and many little jokes about God. None of them were blasphemous, it was sort of the way one might joke about one’s earthly father. So to me, such jokes are normal. To someone from a different type of family, it might be less natural.