Sesquipedalian (adj.)

(Of a word) Containing many syllables.

(Of a person) Having an advanced vocabulary.

Loquaciousness (adj.)

(Of a person) Having a tendency to talk a lot; garrulous.

(Of a sentence) Using far more words than necessary; verbose.

Therefore, "Sesquipedalian Loquaciousness" refers to the tendency of a (usually) highly intelligent person to use extremely large words in mass quantities in order to sound more intelligent. Commonly found in chemistry and other ambitious majors.
Done right, it makes the person sound like someone who oughta be respected and paid attention to, because they definitely know what they're talking about.

Done wrong, it makes the person sound condescending and/or pretentious.
I started playing Words With Friends with Stephen. Terrible mistake. I should have known his sesquipedalian loquaciousness would give him the advantage. He wipes the floor with me every time!
by Someone who kinda exists April 25, 2022
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"Why must you be such a loquacious jibe, Ronnie? RONNIE! Pay attention to me when I'm talking to you! RONNIE! You are a naughty, naughty, VICIOUS little boy!"
by Hannancheesesandwich & Caw October 17, 2008
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It's a synonym for talkative. Use it in your essay child, use it.
Person 1: 'bla bla bla bla BLa blA BLA...' Person 2: "OMG, Person 1 is so loquacious!
by Ihatekpop August 1, 2018
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When your team is trash talking in voice chat and you have a lead and you end up losing the game.
loquacious effect nerd.
by JohnnyUwUChan November 17, 2020
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