Ressuscite comes from the verb ressusciter, meaning to resurrect or revive. It's a strong and evocative word that isn't commonly found in everyday French pop songs.
In the context of "Sea, Sex And Sun," Serge Gainsbourg uses it to describe a feeling of being brought back to life or re-energized by the summer, the sun, and the youthful energy around him. It adds a dramatic flair to the simple pleasures of the season, making it an interesting and memorable choice.
Gainsbourg turns the title into the whole chorus: three English words, 'Sea, sex and sun,' chanted over a stomping disco beat until the phrase stops meaning anything and just becomes a sound you move to. Everything else in the song is French, and it stays fixed on one thing, a body on a beach in full sun. 'Le soleil au zénith' [the sun at its peak] sets the hour, then he gets specific about age: 'Vingt ans, dix-huit / Dix-sept ans à la limite' [twenty years old, eighteen / seventeen years old, right at the limit], the kind of line only Gainsbourg would sing this cheerfully.
He calls her 'de la dynamite' [dynamite] and describes 'Tes p'tits seins de bakélite / Qui s'agitent' [your little bakelite breasts, jiggling]. Bakelite is the stiff old plastic radios used to be made from, an odd, almost industrial way to describe skin, and that mismatch is the joke. By the last minute the French drops out completely and it's back to the hook on repeat, built for a beach full of people who don't need a word of it translated to sing along.