A truck tailgate extension is constructed of a truck tailgate that has a first cavity therein and pivotally engaging a truck bed; a first extension that has a second cavity therein slidingly engaging the first in a transverse direction of the tailgate and concealable by the truck tailgate when retracted; at least one second extension slidingly engaging the second cavity in a longitudinal direction of the tailgate and concealable by the first extension when retracted into the second cavity; a pair of support legs pivotingly engaging a bottom surface of the at least one second extension and stows into a corresponding pair of recessed slots in the bottom surface; and a third extension hingedly connected to a rear edge of the first extension such that the third extension pivotingly engaging an interior surface of the truck tailgate when in a stowed away position.