For example: https://www.youtube.com/watch?v=4hZUvuvfDQg
It's also old slang for a drinking bender:
https://idioms.thefreedictionary.com/on+a+toot
Mastadon really should have done a little more due dilligence before deciding on that term.
Even ignoring that, the word "tweet" viscerally feels light, nimble, quick, and sharp. Toot feels heavier, duller, and more imposing. To end users, the interface is the software and no amount of technical or logistical impressiveness will overcome something being viscerally off-putting. It needs to become attractive in spite of that.
It did, until Twitter spoiled that. Hearing 'tweet' I somehow get associations with 'trump' (also slang for fart in British English, btw) and 'musk' (a strong odor).
[EDIT] nb I don't use Mastodon and don't expect it to take off, but I don't think "toot" is at all the reason for that.
Adoption is really important for social media to succeed and be useful to its users and image is really important for social media adoption, generally, even if not for you. But I guarantee its influenced your choices more than you could feasibly perceive. Would you still use HN if it used the default bootstrap layouts? Or a ton of slick graphics and heavy animations? Would enough other people be put off by it not to bother?
You can't guarantee everything will strike everyone the same way, but there are wrong answers and it's not even mostly subjective. In an alternate Twitter-free universe if someone wanted a noun/verb for a deliberately lightweight communication broadcast into the ether over the internet, I'd bank a grand on marketers agreeing that a cheerful, sharp little chirp from a nimble, energetic bird communicates that better than the plaintive sounding crescendo of a giant plodding extinct earthbound mammal which also is outdated slang for a fart.
Nobody user is out there weight the pros and cons of the post name when deciding a social network— it's all about that first visceral impression that makes people think "this is cool and exciting" or "this is dull and lame."
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I'm not sure who "snd" is, but they drew a nice tooter :)(hopefully anticipating a "trunk raised, toot blasting" ascii art response worthy of the thread)