A phrase which is used when you're talking about someone behind that person's back, and that person appears on the scene.
Peter and Randy are having a nice discussion about Ron:
Peter: "You know, I have never seen anyone with such a big, hairy stomach as Ron!"
Ron appears to the scene
Randy: "Speaking of the devil."
If Ron hears this, it might leave him confused
and maybe a bit hurt, wondering what Peter and Randy were saying about him.
Poor Ron. Of course it all depends on how Randy said it; if he had said it to Ron with a smile that says "I'm just
!", Ron would have realized
that Randy wasn't serious
if Randy had said it to Peter with with an icy
tone in his voice,
his back deliberately
turned to Ron, then Ron would have, in case he heard it, been aware
that Peter and Randy were talking something bad
about him. Bastards