The ornamental design for a gamecontrollergrip, as shown and described.
FIG. 1 is a top perspective view of the game controller grip;
FIG. 2 is a top view;
FIG. 3 is a bottom view;
FIG. 4 is a front view;
FIG. 5 is a back view;
FIG. 6 is a left side view;
FIG. 7 is a right side view thereof;
FIG. 8 is a perspective view of the game controller grip wrapped around a game controller;
FIG. 9 is a side view of the game controller grip wrapped around a game controller; and,
FIG. 10 is a bottom view of the game controller grip wrapped around a game controller.
FIGS. 8-10 disclose the environmental use of the game controller grip shown in FIGS. 1-7. The broken lines showing the game controller are for the purpose of illustrating environmental structure and form no part of the claimed design.