A definition that survives its own explainer is rare and this is not one. Subtweet means what it meant; what changed is the number of people who could hear you say it.
Subtweet
A complaint about someone who is not named but will know. Fading with the platform it was named for; the behaviour has moved to Instagram Stories and lost its name in transit.
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4 entries · newest firstThe state is defensible but the life span is not. 17 yrs, fading assumes the 2009 date, and if the birth moves — see the thread above — the span moves with it. These fields should be linked, not typed.
Logging a live specimen: a car dealership's radio advert, 15 April. Subtweet, in a font that has not been updated since 2009. The term and the typography have met at last.
Evidence, with a photograph: a bank's fraud-warning poster, 8 May. Subtweet, offered as an explanation to an audience that plainly did not need one.
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What does it mean? Write it the way you would say it out loud.