(Obviously unsuitable for kids or the sexually modest.)
cock time, an atrocious pun on clock time, from the Tumblr gallery of penis4u: a very substantial, fully erect penis wearing a (sturdily masculine) watch. In the hope of getting the image on WordPress (it is transparently NSFW and certainly not acceptable on Facebook), I have cropped the photo so that it shows only a few inches of shaft — which might as well be a piece of light colored wood.
An atrocious pun, but satisfying in that some taboo item is not merely introduced into a context for a near-homophone, but participates in the world of that model expression. We see something that’s a cock and a (kind of) clock.