First, this phrase appears to be a non-standard or possibly conflated term. "Lesbiennes" (French for lesbians) combined with "culottes" (which can mean underwear or a type of short/pant) and "buttage" — which is not a standard French word. The closest French verb might be "butter" (to butter) or "bouter" (to push/put), but neither fits naturally. It's possible you've encountered this term from a specific adult context, slang, or a machine-translation error.
Clothing and fashion play significant roles in how individuals express their identities and how they are perceived by others. For many in the LGBTQ+ community, fashion has served as a tool for expressing one's true self, especially in environments where openly expressing one's sexual orientation or gender identity might not be safe. Lesbiennes En Culottes Buttage