When something is just so right that only one word can explain it. Only one word is relevant enough to highlight the relevance of the situation.
Billy: Hey pass me that ruler why don't you?
Ruth: Why should I do that? Are you going to measure that water tower?
Billy: That's totally unrelevant!
Ruth: It's pronounced irrelevant.
Billy: That's so relevant of you.
An organization of like minded individuals celebrating the art and sophistication of a well groomed mustache. A soul patch is an accessory and not considered part of a traditional mustache. Wearers are not welcome.
Instead of scouring the bookstore or internet for assistance with his calculus homework, Steve spent untold hours engaged in relevant procrastination researching netbook computers "for his mom".
Thing or person once relevant who experiences a resurgence of popularity not because of any skill or talent, but simply because they were once relevant.