In a multiplayer combat game (particularly a First Person Shooter) to kill another player as they spawn. This is dishonorable because the player is unable to react before they are dead or have taken significant damage, and depending on the game may be weaponless or inadequately armed. Often abreviated to SK.
Getting a kill shortly after (re)spawning, or being killed by someone/something that just (re)spawned or became visible.
Can be abbreviated to RSK. Some call this a "Kill Spawn".
I was driving down the road in GTA on a bike when, out of nowhere, an empty plane spawned in a hangar and crushed me. Ouch. But I did get a laugh from that reverse spawn kill.
You would not believe what just happened! I just spawned and was walking out into the fray when someone else spawned right in front of me with a rocket launcher and blasted me to bits! Spawn-to-spawn kills can be insane.
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.