thrum, thrumming, thrummed

Is it really called "thrumming," or am I just knitting thrums into my thrummed mittens? Is it a verb or a noun or an adjective or all three? At any rate, I used the term "thrum" fairly indiscriminately during my long car ride this weekend, since I did a lot of griping about thrumming. The car ride was not as productive as it should have been since I kept messing up. My first mistake was making the thrums ridiculously long, so I had to re-thrum the thrums before I could carry on. My sister generously offered to thrum along with me, so that made the thrums add up much quicker. The rest of the messing up involved trying to guess what size my dad's hand are while knitting. I kept worrying aloud that the weren't going to fit...to which my sister helpfully responded, "...but don't you always knit Dad something that doesn't fit?" As if I wanted to keep THAT tradition alive. But now that I have the first mitten figured out, I'm flying through the second. And the alpaca thrums that I thrummed into these thrummed mittens are soooo soft.