Sesquipedalian
Do you know what this word means?
Well I'm about to explain
Let's see if you can follow me

The definition is: The practice of using long, sometimes obscure
Words in speech or writing,
Basically a really long word

Now let's begin-
The accoutrements for an auspicious bellweather
Would be bought in a very convivialitible manner

As he flaunts his callipygian self in a coruscant mirror
Wanting to be a ebullient cynosure for everyone in the future

Gasconading,
Not magnanimous
Unparagoned,
Not parsimonious

Pulchritudinouss
It's so enervating
To excogitate
His outfit for each and everyday

Grandiloquent, indubitably
His nonchalant milieu
Is going to cause a perfidious
number of issues

One day anyhow
But not right now
His supercilious mouth
Will one day create
A massive debate
Rancorous without a doubt

So now do you understand what Sesquipedalian means?
This little story should've shown
You how to use big words for fun
Now I'll leave you on your own
Isolating with this song