from latin desmos (controlled) and dromos (movement) is a mechanical solution for engine valvetrain movement that does not involve springs for opening and closing valves relying on rocker arms instead thus preventing "valve float". Ducati motorcycles are known for using desmodromic valve actuations on their engines.
"Forget about japanese crotch-rockets, desmodromic is the way to go!"
"Hey, look at that poser on the italian bike. Guess he's never heard of desmodromic actuation. He looks cool, though"
by desmodue68 May 24, 2008
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Someone or Something which is a complete waste of time and effort.
Referring to Italian motorcycle manufacturer Ducati's "desmodromic" valve system, used on high performance motorcycles, which is vastly complicated and would give no observable benefits if integrated into a lawnmower engine.
David you fucking desmodromic lawnmower, for the fifteenth time, get out of my house!

Nah, fixing that shed is like putting Desmodromic Valves on a mower.
by xX_Herbert_McClusky_69_Xx December 28, 2021
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