verb/nə pa sə pʁɑ̃.dʁə puʁ də la mɛʁd/
to think the sun shines out of one's arse, to think one's shit doesn't stink, to think one is the shit, to think one is hot shit (to be full of oneself, to think highly of oneself)
Synonyms: péter plus haut que son cul
Literally, “to not take oneself for a shit”.