The ornamental design for a mop base with slidably attachable male to female mop head, as shown and described.
FIG. 1 is a detailed illustration of a perspective top view of the mop base with slidably attachable male to female mop head.
FIG. 2 is a detailed illustration of a perspective top view of the mop base with slidably attachable mop head with the male to female mop head extended; and,
FIG. 3 is a detailed illustration of a side view of the mop base with slidably attachable male to female mop head.
Portions of the mop base with slidably attachable male to female mop head not shown in the drawings form no part of the claimed design.