A large and generally overwhelming attack meant to disable or destroy an opponent quickly. Generally speaking it is the result of an overuse of large and powerful weaponry with a long refire in order to minimize penalties associated with said weapon systems.
Originally the term was used in the game Mechwarrior, but it has since migrated to become common usage in other mediums and genres.
The alpha strike capability on that thing is very powerful!
Slang for something being destroyed. Refers to the object/creature/person in question being destroyed to such an extent as to be reduced to vapor or a vapor like state. Similar in usage and meaning to the word "Vaporized".
"My ship just got vaped by those bad guys"
"What happened to you?" "I got vaped on the way here by aircraft"