“Tweener” used to be an NBA pejorative, a descriptor used to describe players whose games slotted between two positions; players who could only help you so much because they did not fit naturally within more stringent positional norms. In today’s NBA, however, nearly everyone strives to be a tweener of some sort.
Position-less basketball has taken hold of the league and the more versatile you are the better. Point guards with okay ball skills but 3-point shooting ability and size to defend a small forward? Give me one of those. A PF with only okay height, but great length and enough strength to guard centers and a jumper good enough to camp in the weakside corner on offense?