gamberger

to think hard

“La pauvreté, ça fait gamberger, en deux temps, trois mouvements / On coupe, on compresse, on découpe, on emballe, on vend” — Poverty really makes you think, and before you know it / You cut, you compress, you chop up, you wrap, you sell

Apparently from *comperger, a slang form of compter (“to count, to reckon”).