an improper place, an indecent or bad place; from a- (not), cualli (good), can (place) (see Molina)
Orthographic Variants:
aqualcan
Alonso de Molina:
aqualcan. lugar indecente y malo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 7r. col. 1. Thanks to Joe Campbell for providing the transcription.