What are your favorite big or intelligent words and phrases to use?

Voluminous

Significant, subconscious, preconception, misconception, interpretation, perception, magnitude, element, pertain, familiarity.

Not because I want to sound smart, on the contrary. I usually use these words to encompass a series of vague or relative meanings or elements which pertain to a certain subject, or a part of that subject. It's easier to relate these together with these kinda words without having to make my answers twice as long as they already are. It might leave room for questioning what I'm talking about, but there's always something in the words but which might not be important enough to warrant an example or explanation in respect to the grander scheme. Still, if someone asked, I'd be more then happy to elaborate.
For example I know that the subconscious is responsible for a lot of things, but I don't know much about how it works.
They're usually used as ''filler'' words, but never for no reason.

I love the word exponentially. It is a very satisfying word to use, as it explains something that might otherwise be unclear.

Indeed; as a matter of fact

Well, as an amicable sesquipedalian rhetorician, I utilize a sublime, grandiloquent vocabulary which incites my verbose use of a profusion of interconnecting verbiage that I inexhorably, invariably vocolize with garrulous yet loquacious intent.

"Uhh...I dunno."

cryptic. when i say it, its like an ambiguous array of joy. i feel like a majestic steed, riding translucently into the galactic heavens of the greek gods

I hate it when people floccinaucinihilipilificate me, but I do rather enjoy pointing out that they’re floccinaucinihilipilificating me.

I also laud the medical profession for turning an exorbitant $10,000 charge for treating black lung into a quite reasonable $30,000 charge for treating pneumonultramicroscopicsilicovolcanoconiosis. (Yes, they’re the same thing.) ;-)

Antipodal, which is somewhere near Madagascar from where I live. ;)

Cynosure, which is something I occasionally feel comfortable with being.

Here's a paraphrase that I learned from a certain nunchuckalug mugging Ninja: "Parents should realize that they are the surrogate frontal lobes for their pre-adult children."

Here's a phrase that I saw in one of Lyn's answers: "Absence of proof is not proof of absence".

I like "you're not the boss of me."

I never use a big word when a diminutive word would suffice.

Glib
:D

poop