The ornamental design for a glowingskewer, as shown and described.
FIG. 1 is a perspective view of a glow in the dark skewer showing my new design, a marshmallow is shown in broken lines for illustrative purposes only and forms no part of the claimed design. The dashed lines around the handle indicate the ornamental glowing feature of the handle.
FIG. 2 is a side elevational view of the skewer with top, bottom and opposite side views having the same appearance with a gap that is a continuation of the structure on either side of the gap;
FIG. 3 is a front elevational view of the skewer; and,