A suck-up, sycophant. A puxa-saco is someone to tries to win people over through adulation. This expression originated in Army barracks
Origins of the expression
Puxa-saco literally means “bag-carrier.” Many people think that this expression has a sexual connotation, as saco (bag) is a slang term for testicles. However, the truth couldn’t be further from it. In fact, its origins are in the military.
Recruits had to carry the bags of their battalion officers, as well as their own. The young military men were also notable for treating officers with utmost respect. It quickly became the term of choice to describe people who flatter their bosses in order to gain affection.