tzoyotl.

Headword: 
tzoyotl.
Principal English Translation: 

the anus (see attestations); also called tzincamactli and cuilchilli

Orthographic Variants: 
tzoiotl
IPAspelling: 
tsoːjoːtɬ
Alonso de Molina: 

tzoyotl. el saluonor.
Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 153r. col. 1. Thanks to Joe Campbell for providing the transcription.

Attestations from sources in English: 

tzoiotl = anus;
coionqui = bored;
pochectic = smoky;
pocheoac = smoky;
coioni = it is bored;
pocheoa = it smokes;
tlapoui = it opens;
moxixa = it passes excrement;
cuitlaioa = it passes excrement (central Mexico, sixteenth century)
Fr. Bernardino de Sahagún, Florentine Codex: General History of the Things of New Spain; Book 10 -- The People, No. 14, Part 11, eds. and transl. Arthur J. O. Anderson and Charles E. Dibble (Santa Fe and Salt Lake City: School of American Research and the University of Utah, 1961), 122.