The ornamental design for a motorcycle handle for a drinking cup, as shown and described.
FIG. 1 is a left side perspective view of a motorcycle handle for a drinking cup.
FIG. 2 is a right side view of a motorcycle handle for a drinking cup.
FIG. 3 is a front view of a motorcycle handle for a drinking cup.
FIG. 4 is a bottom view of a motorcycle handle for a drinking cup.
FIG. 5 is a top view of a motorcycle handle for a drinking cup; and,
FIG. 6 is a left side view of an alternative embodiment of a motorcycle handle for a drinking cup in which the stem attaching the handle to the cup is shortened.
The broken lines represent the environment in which the article resides and forms no part of the claim.