We found one dictionary that defines the word cumstained:

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1. cumstained: Wiktionary

Definitions from Wiktionary (cumstained) ▸ adjective:  (vulgar) Stained with ejaculate. ▸ Words similar to cumstained ▸ Usage examples for cumstained ▸ Idioms related to cumstained ▸ Wikipedia articles (New!) ▸ Popular nouns described by cumstained ▸ Words that often appear near cumstained ▸ Rhymes of cumstained ▸ Invented words related to cumstained