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Saying you're down to do something means the same thing as saying you're up for it.
(discuss.tchncs.de)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
Aussie chiming in: haven't heard hands up before, might be a US thing
US here, we use "hands down".
I think some people are deliberately trying to fuck up intergenerational understanding by teaching weird or opposite versions of phrases and other cultural tokens