The ornamental design for a barbecuegrill, as shown.
FIG. 1 is a front-left-top perspective view of a barbecue grill, showing my
new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a rear
elevational view thereof; FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof; FIG. 6 is a top plan view
thereof; and, FIG. 7 is a bottom plan view thereof.