A "Double Groom Doom" is an event that occurs when two homosexual men want to tie the bow together knowing the marriage will probably fail.
Chuck wants to marry Carl, but Carl has a strong phobia of penis, and Chuck likes to play ass pirate.
Carl is going to marry Chuck, but Chuck has drinking problems, drugs problems.. etc. Carl is a parole officer.
obvious Double Groom Doom
Things don't workout in a gay marriage, you get the idea.