Oregon's 2011 signee De'Anthony Thomas calls himself the Black Mamba. (Or "Momba," if you will.) He is also 18 and probably far too candid for his own good, a factor magnified by him having a Twitter feed where he can say whatever he likes. Sometimes those things concern NCAA investigators coming to talk to you, and when they do people tend to take notice.
The NCAA talks to recruits with some frequency, so this is isn't the kind of thing that should send Oregon fans diving out the window in despair. It does add some fuel to the rumor-fire started by Colin Cowherd (among others) that Oregon was the subject of some scrutiny by the NCAA.
This does not mean they are the only ones being investigated, by the way, or that they've done anything wrong. It simply means there's one documented instance of them looking, that's all. Deep breathing, Ducks fans. Deep breaths, a little chamomile tea, and remembering that the NCAA's speed of enforcement means even if there's something to this you won't see punishment for five years anyway at worst.