"We are 12 in this bitch like a hooligan" is a well-known expression in France, but here it's traduced: in french it would be: "On est 12 dans cette pute comme un hooligan". This expression is used mostly in the east of France. You can use it when you are turning up to a song or freestyling with your friends (basicly when you're having a great time)
Pierre: Hey man can you put that japanese hardcore trap beat on the aux so we freestyle like garbage
Justin: e-yo man that's a great idea, who's dropping them bars first, you ?
Pierre: Nah man go ahead , I'm not feeling it right now,
*music starts*
Justin: WE ARE 12 IN THIS BITCH LIKE A HOOLIGAN OUH OUH......
Pierre: Wow man I'm ready now
*starts freestyling in yedish*