He doesn't mention or describe the title "Oaf" in the actual song, but the definition is a clumsy or stupid person.
My best guess is that Ian is talking about a relationship that just ended where he's left asking himself, "How did this person end up at my door/in my life?". The line, "Throw the rocks and break the glass" may refer to the saying, "Those who live in a glass house should not throw stones", which calls out someone for hypocrisy. Perhaps he's been saving himself for a great relationship and now that he encountered a bad one, he's not sure if his luck to find that good one has run out. Through the title, "The Oaf", he's probably thinking "Man, how stupid was I to be in that relationship".
He doesn't mention or describe the title "Oaf" in the actual song, but the definition is a clumsy or stupid person.
My best guess is that Ian is talking about a relationship that just ended where he's left asking himself, "How did this person end up at my door/in my life?". The line, "Throw the rocks and break the glass" may refer to the saying, "Those who live in a glass house should not throw stones", which calls out someone for hypocrisy. Perhaps he's been saving himself for a great relationship and now that he encountered a bad one, he's not sure if his luck to find that good one has run out. Through the title, "The Oaf", he's probably thinking "Man, how stupid was I to be in that relationship".