くそ

Etymology 1
Likely from.

Suffix

 * 1)  a suffix attached to a person's name
 * 2) * circa 947-957, Yamato Monogatari (#138):
 * "ja"
 * "ja"
 * "ja"

- 「いで、主殿のくそ. あづま、取りて」

Etymology 2
From the suffix above. With the omission of the name, this becomes a general second person personal pronoun.

Pronoun

 * 1)  second person personal pronoun: you
 * 2) * circa 959-965, Heichū Monogatari, chapter 17:
 * 3) * late 900s, Ochikubo Monogatari, volume 4:
 * "ja"
 * 1) * late 900s, Ochikubo Monogatari, volume 4:
 * "ja"
 * "ja"
 * "ja"
 * "ja"

- 「いで. その琴、彈き給へ. 横笛は、月には、いと、をかしき物ぞかし. いづら. くそたち. 琴、取りて參れ」