The ornamental design for an automobilefloormat, as shown and described.
FIG. 1 is a front perspective view of an automobile floor mat, showing my new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken line showing in the drawings is included for the purpose of illustrating unclaimed portions of the automobile floor mat and forms no part of the claimed design.