The ornamental design for a drinkmixer, as shown and described.
FIG. 1 is a front, top and right-side-perspective view of a first embodiment of a drink mixer;
FIG. 2 is a rear, top and left-side perspective view thereof;
FIG. 3 is a front-elevational view thereof;
FIG. 4 is a rear-elevational view thereof;
FIG. 5 is a right side-elevational view thereof;
FIG. 6 is a left-side-elevational view thereof;
FIG. 7 is a top-plan view thereof; and,
FIG. 8 is a bottom-plan view thereof.
The surface shading, if any, illustrated in the drawings is provided merely to highlight the contour of the design; it is not intended to be illustrative of texture or gloss.