Whisk ½ cup of beer, garlic, lime juice, soy sauce, salt, mustard, pepper, thyme, and cumin together in liquid measuring cup.
Refrigerate remaining beer, still in can, until ready to grill.
Using your fingers or the handle of a wooden spoon, gently loosen the skin covering the chicken breast and leg quarters. If using thighs or leg quarters, loosen the skin covering the meat accordingly.
Using a paring knife, poke 10 to 15 holes in the fat deposits on the skin of the back.
Tuck the wingtips underneath chicken.