a ball player, one who plays the ball game that involves hitting the ball with the hips or buttocks (see Molina)
Orthographic Variants:
ullamani
Alonso de Molina:
ullamani. jugador de pelota desta manera. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 158v. col. 2. Thanks to Joe Campbell for providing the transcription.