The same as spoiling but with a twist. It is saying that a character did not die in the movie and is still alive instead of telling the person who dies.
Mark: Oh boy I’m about to see endgame!
Chris: Nice! You know Thor doesn’t die!
Mark: Damn it chris! You just second hand spoil!
When you use a bong or pipe after someone has used it for a spliff or mole bowl and get a head rush from the nicotine.
Jared used my bong after I ripped a spliff and he got second hand domed.
When you get horny from hearing of someone else's sexual interactions
I got Second Hand Horniness when hearing about Jacob's girlfriend
when a sober person pretends to be drunk or acts stupid among drunk people
is that guy drunk?
no, it's just second hand drinking
The liquid that comes out of your ass after the first cup of coffee
“Dude I’m about to go brew some serious second hand coffee”
Blasting taliban with a machine-gun
Gay Tony: Holy shit we're getting shot at by taliban
Joe Shmoe: Don't worry, I'll blast that sandnigger with my machinegun. Shit shoots 50 freedom's per second.