The ornamental design for a drinkingglasschiller, shown and described.
FIG. 1 is a right side view of a drinking glass chiller showing our new design, the left side being a mirror image.
FIG. 2 is a perspective view thereof.
FIG. 3 is a front view thereof.
FIG. 4 is a rear view thereof; and,
FIG. 5 is a top plan view thereof.
The broken line showing of the threaded member as best seen in FIG. 3, the snowflake emblem and any other broken lines are for illustrative purposes only and form no part of the claimed design.