The ornamental design for a drinkingglass, as shown and described.
FIG. 1 is a perspective view of a drinking glass in accordance with the present invention;
FIG. 2 is a left side elevational thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken lines in the drawing views are included for the purpose of illustrating portions of the drinking glass that form no part of the claimed design.