"What does the word aesthetic even mean?"

Just like any other teenager of this generation, I googled it too.
The results describing this term were literally how much I knew already:

"aes|thet¦ic
concerned with beauty or the appreciation of beauty"
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The aesthetic is something with extraordinary beauty that gives peace and satisfaction to the human eye, and how to 'Go Aesthetic' when bullet Journalling? Here's how--

1. Think clear-- What are the things that look really, really pretty?

2. After you've done all the thinking, make a list of all those things and time to search some images on Google or maybe in some magazines.

3. When you're ready, cut them out!

4. Paste the cutouts randomly wherever you think there's a need to draw something extra, GO FOR IT! There's never harm in trying, but don't forget to use the pencil!

5. After you've pasted the cutout, just use similar pens to write! Maybe try creating watercolor effects of the same color combinations.

6. After you've done everything, add washi tapes, stickers and make doodles to fill!

7. If you are satisfied, then ta-da! You have an aesthetic themed bujo spread!

(I PERSONALLY LOVE THE BLACK AND WHITE SPREAD THE MOST!)
Thank You for reading! I hope this helped you, check my Instagram account for some references too!