We've all heard of St. Elmo's fire, right? Here's a new synonym (for me, at least): corposant.

More interesting, it comes from the Portuguese:

Etymology: Portuguese corpo-santo, literally, holy body

Heard of this term, AnnaS? Corposant ends to sound like "ant".

Sounds like it should mean 'almost fat'.

....ends to sound like "ant".

Uh-oh. Here we go again.