I've noticed a few forums (including this one) underlining certain words and providing a definition. (example = SEO) How can I get this on my forum? Sorry if this is obvious or a really nooby question, but I can't seem to find it in any searches.
This is a vBSEO feature. There may be a modification at vB.org that can offer this functionality. A search yields this thread: Acronyms for vB - vBulletin.org Forum. I'm not sure if it works, or if it does exactly what vBSEO does, but you may want to look into it. Thread moved to Forum Software.
I remember seeing a mod that allowed you to build a glossary of words, and I believe it allowed you to underline and link them to the definition as well.