Posted.

Well posted up in the subject. Thoroughly informed. The metaphor is from posting up accounts, where one can see everything at a glance.

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.

Posse
Posse Comitatus (Latin)
Posset
Post
Post Factum (Latin)
Post Meridian (Latin)
Post-mortem (Latin)
Post-mortem Degree (A)
Post Obit
Poste Restante (French)
Posted
Posteriori
Posthumus (Leonatus)
Posting-Bills
Posy
Pot
Pot-boilers
Pot-luck
Pot Paper
Pot-Pourri (French)
Pot Valiant