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Here is a first paragraph of a Meta SE post. It has a common word, "drop," that I don't understand in this context (the bolding is mine):

Recently, it was announced that the "Hot on Meta" questions would no longer show up on the SO sidebar. Sara Chipps elaborated a drop on why:

Does "drop" here mean the same as post in this context? Does it come from the idea that one drops a post into the ethernet, like one drops a letter into a mailbox?

Merriam-Webster has

d: a place or central depository to which something (such as mail,
money, or stolen property) is brought for distribution or transmission

left the package at the drop

also : the act of depositing something at such a place

made the drop

Is this the dictionary definition that comes the closest to the usage in that Meta post?

Considering in the same link the person says, "possibly a drop longer", a synonym for "drop" in both cases that's makes sense is "bit", meaning a small amount. Drop can be found to be a synonym of bit in some online references.

https://www.thesaurus.com/browse/drop

Is this the dictionary definition that comes the closest to the usage in that Meta post?

No, the dictionary definition that comes closest is 1b in the same Merriam-Webster entry:

a minute quantity or degree of something nonmaterial or intangible

So when Sara Chipps elaborated "a drop" on why, she only explained the reasons "a little bit", "to a small degree", ever so "slightly".

Recently, it was announced that the "Hot on Meta" questions would no
longer show up on the SO sidebar. Sara Chipps elaborated a drop on
why:

From context, the meaning appears to be akin to an 'information drop' - either a guess or actual cause. Perhaps the term was off-the-cuff, or even shorthand from a particular occupation.

Edit: After seeing the thread, I now agree that the most likely candidate is "a bit", a small amount.