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1.
Movie from eighties about a buncha recent Georgetown grads that all frequent a bar called St. Elmo's. Starred Demi Moore, Rob Lowe, etc. In the movie, it explains that St. Elmo's Fire is a natural, atmospheric phenomenom that sailors mistook for lighthouse beacons, thus giving them reassurance that land was close. Something like a security blanket that gives comfort and reassurance in troubling times.
If u've seen the aurora borealis, then u should also check out St. Elmo's Fire.

Ever seen that movie, "St. Elmo's Fire?"

My mistress was my St. Elmo's Fire during my messy divorce.
by knasdf September 14, 2005
 
2.
An electrical phenomenon that causes a blue aura to emanate from certain structures during times of high static electricity. St. Elmo's Fire is often seen by sailors on ships at sea during stormy weather. Sailors in centuries past believed it was a good omen. St Elmo's Fire is known to have caused a high degree of intelligence to be possessed by person's known to have it course through their body.
Examples of such intelligent people whose genius was caused by St. Elmo's Fire are the following: Albert Einstein, Plato, Aristotle, Socrates, and The Anonymous Pastor of the Church of the Better Resurrection.
by anonpastor December 15, 2012
 
3.
an electro-luminescent corona discharge between nipples during sex..
with bosom's in each ear when things heat-up st. elmo's fire starts. Its shorts out your brain for about 10 seconds!!!

by itichie_nocanpo August 10, 2006
 
4.
When you're doing a girl in the butt from behind, you reach over to the nearest fire source and use it to light her hair. Then when she is running around the room screaming, spray her with a fire extinguisher.
Why are you covered in all that white crap? And where's your heair?

My boyfriend did A St. Elmo's Fire to me last night.

Oh, thats awesome.
by Pj McGintey April 05, 2005