The ornamental design for a slopemower, as shown and described.
FIG. 1 is a perspective view of a slope mower showing our new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a back perspective view thereof;
FIG. 4 is a right-side perspective view thereof;
FIG. 5 is a left-side perspective view thereof;
FIG. 6 is a top perspective view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the figures represent environment in which the new design may be embodied, and form no part of the claimed design. Any shading in the figures is provided to illustrate contour only, and is not an indication of texture, gloss, etc.