The ornamental design for a nontippingcoffeemug, as shown and described.
FIG. 1 is an environmental perspective view of a nontipping coffee mug showing my new design;
FIG. 2 is a front elevational view with the rear view being a mirror image thereof;
FIG. 3 is a right side elevational view with the left side being a mirror image thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
The broken line showing of the building material in FIG. 1 is for the purpose of illustrating environment only and forms no part of the claimed design. The broken line showing of the handle in FIGS. 1 and 3–5 is for the purpose of illustrating types of handles that may be used and forms no part of the claimed design.