At the end of a level in a video game you typically fight a much larger enemy with much more health, called a boss
. Typically these bosses are defeated by figuring out their pattern of attack.
See Also: mini-boss
"The boss fights in Metroid Prime kick ass!"
Rubbing of the genitals in the face of ones partner, out of excitement, when said partner is busy doing something important.
I had a boss fight with my girl when the Red Sox won the World Series I hope her Mom didn't hear it through the phone.
A bossfight is any encounter or situation that is particularly difficult or challenging.
Yeah, I'm meeting her parents tomorrow - it's going to be a total bossfight.
The big, mean, cheapass mofo you fight at the end of a video game, usually fighting games. Most infamous of the lot are the SNK bosses of KOF and Fatal Fury etc.