there's nothing to it; or not worth paying attention to (see Molina)
Orthographic Variants:
aquen ca
Alonso de Molina:
aquenca. no va nada en ello, o nohaze al caso. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 7r. col. 2. Thanks to Joe Campbell for providing the transcription.