The sexual act of sneezing and consequently sharting on the male genitalia during full-penetration anal intercourse. A Peruvian Honk-Toot does not have to be intentional, nor is it exclusive to same-sex intercourse. However, the act must occur during penetration, or else it does not fit the definition. In some cases, couples will purposefully tickle the receptive partner's nose with a feather or some other object to elicit a Peruvian Honk-Toot for sexual gratification.
Jessica gave me a Peruvian Honk-Toot during butt stuff yesterday— Gross! I dumped her shortly after.