A standard adjective meaning "thick" or "coarse." In this specific slang context, it is used as a vulgar descriptor. Context of Vulgarity in Persian

The phrase you mentioned appears to be a vulgar or explicit expression in Persian (Farsi). While it has appeared as a placeholder title in various academic PDF uploads and study guides found on certain university portals, it is not actually the subject of those documents.

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If you are interested in learning authentic Persian expressions that are colorful but socially acceptable, there are many poetic and common idioms: My 11 Favorite Persian Idioms and Expressions