verb/a.vwaʁ le dɑ̃ dy fɔ̃ ki bɛɲ/
to feel like one is going to throw up (usually because one has eaten too much and is stuffed to the gills)
Synonyms: avoir le cœur au bord des lèvres
Literally, “to have the back teeth swimming”. Compare English my back teeth are floating, albeit with a different meaning.