tlayelpaquiliztli.

Headword: 
tlayelpaquiliztli.
Principal English Translation: 

a dirty or carnal delight (sexual pleasure) (see Molina)

Orthographic Variants: 
tlaelpaquiliztli
Alonso de Molina: 

tlaelpaquiliztli. suzio o carnal deleite.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 120v. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

tlayelpaquiliztli = foul happiness
Louise Burkhart, The Slippery Earth (1989), 105.