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The technical term for those who are plagued with the constant act of falling upon their faces whenever they are knocked over, despite how they fall down. This is often present with prissy gay boys; Named after Cygnus Hyoga, the first victim of the disease.

This is well known by the many fangirls and gay followers of the popular 1980s manga and anime series known as Saint Seiya (Knights of the Zodiac in US).
Fangirl#1: Oh my god, did you see him faceplant just from getting shoved?

Fangirl#2: I did! Poor thing must be suffering from Hyogaitis.
by Pseudonym goes here February 21, 2010