The ornamental design for a guthookbladedpipeslitter, as shown and described.
FIG. 1 is a left side view of our design, the right side being a mirror image;
FIG. 2 is a top view thereof, the bottom being a mirror image;
FIG. 3 is a front top left perspective view thereof;
FIG. 4 is a front left perspective view thereof;
FIG. 5 is a front top left perspective view thereof; and,
FIG. 6 is a front view thereof.
The broken lines depict portions of the gut hook blade pipe slitter in which the design is embodied that are not considered part of the claimed design.