No, you're thinking of an orgy. Trains and gangbangs are both many-to-one, with the difference between them being that the former is sequential while the latter is simultaneous.
This is more porn knowledge. Most people don't actually experience gangbangs or orgies in their lives. Maybe if someone is into the whole swinger culture.
Edit: and yes, this joke is older than the gods as evidenced by the presence of finger, and I'm not sure clean is a thing in modern UN*X distros. Not in FreeBSD at any rate
Look, some of us take our time, and so others think the process has stalled, but it will complete eventually. Just take a number and you will be summoned in the order you arrived.
And will someone hose the party favor down? And how do you even get that on the ceiling?! Joey TAKE THE HOSE OUT OF YOUR ASS!
American here, never once heard this phrase used. Seems kind of dumb to have it, like it doesn't even save time describing the situation and if you're already talking about this then you're past the point of vulgar language.
Getting (CONSENTUALLY) gangbanged by A LOT of guys, like enough that it starts to involve logistics planning to accommodate that many people being in a single space at one time.
