ob-

prefix

Etymology: Clipping of obligatory.

Obligatory; prepended to the name of a topic being mentioned to avoid accusations of being off-topic.
“ObGoth: Uh, well, it's like this you see, <searches in random file o' obgoth things> anyone out there got the new CoX album on Tess? If so which album is it *most* like?”
“Aren't Newcastle's chairman Sunderland supporters? (From the way they acted?) Erm...obspeccy? Tynesoft, eh? What happened to them?”