Place garlic, thyme, rosemary and 1 can of beer into a large plastic ziplock bag. Add the bird and seal. Give a shake and put in refrigerator overnight or for at least one hour.
Preparing the bird
Preheat grill to medium-high. Remove bird from ziplock bag at least half an hour before grilling. Pat dry.
Rub spice mixture all over the bird ensuring you get into cracks and crevices. Sprinkle with salt and pepper. Drizzle with olive oil.
Open beer, pour or drink about 1/4 of the beer. Slide bird on pushing all the way down.
Place on grill and let cook with lid down approximately 1-2 hours depending on your BBQ and size of your bird. Your meat thermometer should register an internal temperature of 165F.
Remove from grill and carefully (with oven mitts or help) remove bird from can. Let rest 10-15 minutes before carving.