The ornamental design for a drinkcooler, as shown and described.
FIG. 1 is a perspective view of a drink cooler;
FIG. 2 is a left elevation view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a right elevation view thereof;
FIG. 5 is a rear elevation view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines showing a bottle depicts environmental subject matter that forms no part of the claimed design, while the remaining broken lines shown in the drawings depict portions of the drink cooler that form no part of the claimed design.