n. (Your Dudness or His Dudeness or Her Dudeness) title used to establish one's ultimate position in the "dude" hierarchy, "Dudeness" being the ultimateruler of all or at least most other dudes.
A deadline that is expected to or has already moved. Proper deadlines are immovable because they're "dead"; movement betrays non-deadness, and because deadness is the defining feature of a proper deadline, its absence renders the linedud.
Greg: Right, I'm going down the pub.
Brad: But you haven't finished your coursework essay yet and the deadline's tomorrow morning!
Greg: Chill dude, that's actually a dudline.
Brad: You don't know that!
Greg: Sure I do. Just look at what happened the last two times.
Brad: Hmm, yeah, I suppose you'reright.