noun
oracle; revelation; divine message
Refers to a message from a deity or spirit, often delivered through a medium or shrine. The honorific prefix ご adds a respectful tone.
神社でご託宣をいただいた。
I received a divine message at the shrine.
noun
tedious talk; pretentious speech; saucy talk
Used sarcastically or critically for long-winded, self-important, or impertinent speech. Often implies the speaker is going on and on as if delivering a divine pronouncement.
彼のご託宣にはもううんざりだ。
I'm fed up with his tedious lectures.
またご託宣が始まったよ。
There he goes again with his pretentious talk.
Combination of the honorific prefix ご and 託宣 (oracle, divine message). The sarcastic sense likely developed from the idea of someone speaking as if delivering a divine pronouncement.