It is a term/ action one uses when an establishment cannot serve their food properly, which results in McGangsta's ignorance, improper use of an emergency line, and a few days in the lock up.
K'Mark'Tina: " i needs me a 9 piece mc nugget mealz, fo me n my 19 kids to eatz."
employee: "we don't have any mc nuggets."
K'Mark'Tina: "WUT U SAY?!?! U AINT GOT NO WUT??. o HELL nah. i'm bout ready to get MCGANGSTA up in here! sheeeeet. THIS IS A EMERGENCEE!! i callin the po-lice up in here! i needz my mc nugget! 911!!! 911!!"
employee: "maam, that wont be necessary, we have plenty of other items...."
K'Mark'Tina: "SHUT YO MOUTH HONKEY!!! I'M GETTIN MCGANGSTA on stoopid ass"