The ornamental design for a hookahbase, as shown and described.
FIG. 1 is an orthographic view of a hookah base showing the new design.
FIG. 2 is a top perspective view of the hookah base; and,
FIG. 3 is a lower perspective view of the hookah base.
The hookah base is understood to be radially symmetric. The broken, dotted lines depict portions of the hookah base which form no part of the claimed design.