lèche-cul

From lécher (“to lick”) +‎ cul (“arse, hole”). Said because the ass is considered vulgar and being willing to kiss another's is considered a sign of submission and patronage.

• IPA^(key): /lɛʃ.ky/

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lèche-cul m or f by sense (plural lèche-cul or lèche-culs)

1. (vulgar) ass-licker (US), arse-licker (UK)

   Synonyms: lèche-bottes, cire-pompes

• “lèche-cul”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.