The term "Odeholo" has been bandied about for a while now, and today Kadokawa decided to clarify the mysterious abbreviation - hololive is celebrating its 10th anniversary with a TV anime adaptation, hololive: Let's Head Out!
From the Press Release:
With fans from across the world who have journeyed together all these years, hololive marks its 10th anniversary with a special project - a TV anime adaptation. This anime adaptation announcement set social media platforms aflame with excitement and had fans guessing what the mysterious keyword “Odeholo” could possibly mean.
During the special program on September 23rd’s livestream, the mysterious keyword “Odeholo” was revealed to be the abbreviated official anime title “Odekake hololive”, with the official English title “hololive: Let’s Head Out!”. Along this, a striking teaser visual featuring all 29 hololive members starring in this anime has been released! Additionally, the anime introduction has also been unveiled! Please look forward to the fun-filled adventures of the members as they travel across Japan!

Official anime X account: https://x.com/odeholo (@odeholo) / #おでホロ、#Odeholo
Official anime YouTube channel: https://www.youtube.com/@odeholo
Official anime website: https://odeholo.com