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1.
someone who is really wise and has alot of sense.
Thats a very sagacious comment you just made.

The way he talks is very sagacious
by Olivia Palmer March 10, 2007
 
2.
Shrewd, or having incredible common sense, also
just being an overall smart-ass/quick wit.
Man 1- "Hey, man, did you see that bitch?"
Man 2- "That one?"
Man 1- "Yea, I was like 'let's go back to my place' and she looked at me and said 'no way, I only do good-looking guys.'"
Man 2- "Jeese, that's rough. What a sagacious slut."
by Jamsie June 02, 2007