Why tantrum should be a verb

I named my blog after a conversation I had with my husband about my youngest son, who is really good at throwing what I call "silent tantrums." At age two, I guess I should be grateful they are silent. J had thrown himself down on the floor in protest over not being able to do something his older brother, age 6, was allowed to do. My husband said, " What's J doing?" And I replied, "He's tantrumming on the floor." Of course, tantrumming isn't actually a word, but it seemed to fit perfectly with what J was doing at the time.