Cliff Diving is the act of last-minute bowing out of a social engagement amongst friends or colleagues, because you're secretly binging on pornography. The "drive" of Cliff Diving, refers to the heads-over-heals nature of the pronograhy binge.
Where's your boy at? Where all here at the bar!
Oh, he's not answering texts. He's probably Cliff Diving on that butt porn.
Probably true.