Only if one is into necrophilia.

Someone I met in a bar urged me to Repurpose my assets. I backed away slowly -- did I do the right thing?

I think it is highly likely that you did precisely the right thing. It's a a gay chatup line.

Years ago I was offered a Rum Baba. I had no idea how to conceal my awful ignorance.

A Rum Baba, at least if you come from Wales, New Zealand or Australia, is a strange (read very strange) sheep. Whilst we are on the subject of strange phrases, I was up the local shops the other day and one of the proprietors mentiond a Virtual Ending. Did I hear this correctly, or is there something that I am missing?

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?