It's a term used in Miami Florida
It's meaning stems from the word "Train", performing group sex on one female who is willing.
Usually men find a girl who is fucked up enough or down to fuck. Some guys fuck a girl in the dark then
call other guys to come through and fuck their girl when they are bored and thats how some trains start.
Jimmy is fucking lisa in his room, "Lisa, I'm getting tired, lets take a break", "No Jimmy, I haven't gotten off I need to have at least 10 orgasms before we can stop". Jimmy looks at Lisa sideways, while still fucking her he picks up his phone in one motion. "I am going to call my friend Luis so he can help me out" Jimmy calls Luis, "Yo luis, my girl Lisa wants 10 orgasms and I can't fucking do that, you wanna call a couple homies to come trainbomb this bitch"...."Jimmy, I'm so excited..."
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2million.