[Zariff]

I always think of Andrew Ng's famous machine learning course whenever I hear someone say this phrase. He also used this phrase repeatedly in the videos.

[Haul4ss]

Didn't he used to say "concretely" all the time as well?

That was such a cool course. It seems ancient now, but I remember enjoying it at the time.

[nmstoker]

Yes, he's the person I'll always associate with this phrase for exactly that reason!