An Adjective/Noun that means:
Lacking pain. If someone tells you something will be painless, they are likely lying, and the experience they are describing will usually be painful.
"Oh, come on! Getting stabbed with a 3-foot longneedle will be practically painless!"
Blain's signature mini gun from the classic sci/fi action movie Predator (1987). This can also refer to other memorable, badass weapons in movies and video games.
Blain - (Jesse Ventura): "Come on in you fuckers, Ol' Painless is waiting."
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guy 1: "Dude! you got a triple kill with that Spartan Laser!"
"Man, I can't be bothered to study for this test, I'll just write the answers on my forearm. So what if I get caught."
"Yeah man, suicide is painless."
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. 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.