When you go to McDonald's and ask for a McGangbang and it pisses off the cashier so he shits on your burgers and makes you put them together yourself.
Customer: "Can I have 1 McGangbang please?"
Cashier: "WTF thats not on the menu!"
Customer: "Fine I'll make it myself!"
Cashier: *Makes burgers and shits in them aka Mc Shithead*
Cashier: "Here you go asshole!"
Customer: *Takes a bite of shit*
Customer: "FUUUUUUUUUUUUUUUUUUUU-"
Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.