Bricoleur translates to "handyman" or "DIY enthusiast". It's a charming and somewhat old-fashioned word that evokes a sense of resourcefulness and practical skill.
In the song, Ateyaba raps, "J'sors les outils comme Bob le bricoleur" (I bring out the tools like Bob the Builder/handyman). This line cleverly references the popular children's character Bob the Builder, using the word bricoleur to convey that he's ready to get to work and handle business, much like a skilled craftsman.
"Cartier" is Ateyaba flexing on the come-up. The hook is the whole thesis: you can read the brand name Cartier right off his glasses, because he's out here making money ("je fais du papier, je fais du 'seille" — French slang for stacking cash).
Between the flashes of jewelry and gold, he's telling you to cut off people who use you and to stay confident even when things are tight — he name-drops going hungry with nothing in the fridge in the same breath as calling himself an alien among ordinary people, someone operating on a different level.
It's a boastful, streetwise portrait of hustling your way to a look people notice, wrapped in blunt, unfiltered language typical of French rap.