casser les couilles
What it means
Annoy or bother someone intensely.
Literally “break the testicles”. Short editorial gloss; not an etymological claim.
Pronunciation Heard as “kassay lay koo yee”
English spellings approximate sounds and omit some contrasts. Use as retrieval hints, not authoritative pronunciation.
Used as
How it's used
Normally figurative.
How strong is it? 3/5 · Vulgar
Normally figurative. Ratings are contextual editorial estimates, not calibrated probabilities.