Rape Clock is a meme from 4chan's /b/.
It's a picture of Silent Hill 2's Pyramid Head drawn next to a large clock that says "rape" at every time slot with the hands almost together at one of the "rape"s.
Pyramid Head has one hand up in surprise exclaiming, "Good Heavens, just look at the time!"
"The Rape Clock says I'm late for a 'meeting' in the park. And by meeting, I mean rape."