The ornamental design for a portableappendage, as shown and described.
FIG. 1 is a front perspective view of a portable appendage showing my new design, wherein the broken lines are for illustrative purposes and form no part of the claimed design;
FIG. 2 is a right side view of the same, wherein the broken lines are for illustrative purposes and form no part of the claimed design;
FIG. 3 is a left side view of the same, wherein the broken lines are for illustrative purposes and form no part of the claimed design;
FIG. 4 is a top view of the same, wherein the broken lines are for illustrative purposes and form no part of the claimed design;
FIG. 5 is a bottom view of the same, wherein the broken lines are for illustrative purposes and form no part of the claimed design;
FIG. 6 is a front view of the same, wherein the broken lines are for illustrative purposes and form no part of the claimed design; and
FIG. 7 is a back view of the same, wherein the broken lines are for illustrative purposes and form no part of the claimed design; and,
FIG. 8 is a front perspective view of the same, wherein the broken lines shown are included for the purpose of illustrating environmental structure that forms no part of the claimed design.