"Steady as she goes" is a term used by sailors. It refers to the fact that even though the waters are rough, The Ship is steady on course. In the Song, the meaning could be that his friends are all finding a kink in the Single Life, and as he was pondering, he felt he needed a wife as well. He probably is in a relationship that might be a little rocky, but if he is steady on course, he will reach his end result which is to be in a permanent relationship.
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