Long ago, in a far away place called High School, a friend and I fell in love with the word " theorem ." We proceeded to misuse it awfully, and here I continue that tradition."In theorem" is similar to "in theory." It demonstrates faith in the factual correctness of the referenced statement while emphasizing an attitude of reluctance to act upon it.Person A: "If you didn't read the news first thing in the morning, you might not be so angry all day."Person B: "Yes, in theorem."