ugly or homely woman's face; old bag
Derogatory slang for a woman with an unattractive face; often used in a dismissive or insulting way. The term is dated and may be considered offensive.
That actress has a homely face, but her acting is good.
He called her an old bag.
ぶす is a more common and direct insult for an ugly woman, while おかちめんこ is more dated and specifically refers to a homely or plain face.
不細工 is a general term for unattractiveness, applicable to both men and women, and is less slangy than おかちめんこ.
Katakana spelling sometimes used for emphasis or stylistic effect.
Rare kanji spelling; the kanji are likely ateji and not commonly used.
The origin is uncertain. It may be a compound of おかち (a low-ranking servant or attendant) and めんこ (a dialectal or slang term for face), suggesting a face like that of a lowly servant. The kanji 御徒面子 are likely ateji.