You're not missing anything, although someone else may be. A Virtual Ending is when two people in bed together amicably decide, for whatever reason, that it's not going to work, and just have a snuggle instead.

I recently heard a birdwatcher mention sighting a Trunnion's Warbler. It's not listed in any reference book I've looked at. What is it?

Twitchers' slang originally for a magpie, now applied to any common bird. An amateur birdwatcher called Goately Trunnion famously excited the ornithological world with reports of a pair of Pied Blue-winged Azalea Warblers (thought to be extinct) in his Wimbledon garden. They turned out to be magpies, to Trunnion's eternal shame.

Brighton Snack?

A Brighton Snack is a posh name for a visit to the Massage Parlour.

Gammon Ears

I've come across the word "spotty" in some British literature. At times it seems to mean "pimply-faced" but other times something closer to "cowardly." Is this Brit slang? What is the etymology - anything to do with smallpox?

If, despite being generally quick on the uptake, you unexpectedly commit a social faux pas because you have competely misunderstood something, you can be said to have "gammon ears". An example might be mistaking a foolish word game for a genuine etymological discussion. (I have never heard of "spotty" meaning "cowardly" though.)

Someone once complimented me on my Cat's toenails. Should I be offended?