phrase/tɔ.nɛʁ me ʃjɛ̃/
expression of anger, pain, or surprise: darn it, dang it, damnit
Synonyms: tonnerre, tonnerre et z-éclairs, tonnerre m'écrase
Literally, “thunder my dogs”. Minced oath replacing (que le) tonnerre m'écrase (“(may) thunder strike me down”), which blasphemously calls down the wrath of God.