The term "webe" on IRC in the 90s was commonly used to mean "welcome back." IRC users often developed their own shorthand and slang, and "webe" was one of those informal terms that became popular in certain communities.
However, because it was more of a niche or community-specific term rather than a widely recognized abbreviation, it might not have widespread documentation or references online today.
It’s one of those nostalgic terms that were prevalent in specific circles or chatrooms but didn’t necessarily make it into the broader lexicon of internet slang.