A large crowd of people or a massive pile of objects.
...when I went to the office to get paid, there was no goat from Neiba (a region in the Dominican Republic famous for its goats) that could jump over that jangá of bills.
A big mess, ruckus, or massive commotion, often involving a physical fight or a chaotic public scene. It refers to the chaotic event itself or to the act of someone making a huge scene or causing a scandal.
What a pifostio broke out at the club, even the police showed up. Luis made a huge pifostio when he found out he was not the winner.
A chaotic free-for-all or a mad scramble where a group of people fights to grab something for themselves. It describes a situation that turns into a melee once someone shouts the phrase, causing everyone to start shoving and pulling to get their share.
Garata con puño happens a lot at birthday parties with piñatas, where kids fight each other to get the most candy. You also see it in the government when everyone who supported a party wants high ranking positions and they start arguing and fighting over jobs.