The drowsy and slightly painful state experienced after eating a standard BBQ meal, which is inevitably consumed in very large quantities.
Chipotle's "Barbacoa" burrito is only one example of a large quantity of BBQ beef. While one may very well experience drowsiness or discomfort after its consumption, a true barbacoma can not be had without at least one of the following sides: sweet potato pie, sweet corn, cornbread, or baked beans.
Excuse me while I take a nap. After eating all that food at the BBQ joint, a barbacoma is definitely coming on.