The ornamental design for an electricguitar, as shown and described.
FIG. 1 is a perspective view of the front, top and left side of an electric guitar showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line showing of the electric guitar is included for the purpose of illustrating portions of the electric guitar and forms no part of the claimed design.