Lore, and the associated question "Is this lore?", is a meme within the SiIvaGunner community.
The word "lore" refers to the information about traditions, knowledge, and customs about a certain group. Many different fanbases, such as Star Wars and Lord of the Rings, study and theorize about the "lore" to uncover the often obscure (and ridiculous) background of their obsessions. "Lore" is also used as a synonym of "story".
On SiIvaGunner Edit
As a bait-and-switch channel, SiIvaGunner did not have a plot beyond some minor kayfabe with the channel posing as GilvaSunner, and playing a character of the same name.
Then, SilvaGunner: Rebooted happened. With this story arc, fans of the channel were swamped with questions, some of which appeared to have answers lying in the channel's previous videos: "Futari Happiness (NOZOMI Mix) - Love Live! School idol festival", and the "Megalovania" rips with Chad Warden. While these rips were originally one-time jokes, they were repurposed to make a coherent storyline for SilvaGunner: Rebooted, setting the precedent that any rip could be lore and spawning the memetic question: "Is this lore?"
The term "lore" itself within the SiIvaGunner community was mainly coined and spread by Twonko (before he was a contributor) in the unofficial SiIvaGunner Discord server (Towelcord) that was very active at the time, which naturally made its way to the comments section of reboot rips and became a common term used by SiIvaGunner fans from there.
Starting in Season 2, The SilvaGunner Christmas Comeback Crisis would become the main source of all lore on the channel. Since then, the lore has been more straightforward and not hidden in normal rips, making the question "Is this lore?" mostly obsolete. However, it is still sometimes asked sarcastically on shitpost rips that stray from the usual style and the term "lore" itself has stuck.
See also Edit
Explanations of the SiIvaGunner lore can be found at: