When you watching an action scene in a movie (doesn't have to be a Michael Bay movie) with guns, explosions, and shit so intense you actually start popping chub.
Dude the new Jason Statham movie was awesome! During the car chase when he blows up that building in North Korea I got a total Bay Boner
When an individual, often researchers and scientists themselves, gets very excited about or amazed at a scientific fact, new discovery, unexplained event or new theory.
Eg.
Person 1: did you hear about the discovery of Promachoteuthis Sulcus? I have a total science boner about it
person 2: yeah man I heard they've only ever found one
Person 1: dude it's awesome it's a squid with teeth like structures
Person 2: wow dude this could change the world of squid research