a technique used to kill a chicken, which can very well work on a person who you dont like. Performed by holding the chickens wings up above its head, and then wacking it wit your first hard enough to kill it.
julio se puso de freco con migo el otro dia, ayer cuando lo vi le di un "mata pollo" que lo deje pataleando
means "You good?" and "usi" is another short term for "Uce" or "Uso" which means brother so, mainly used for checking up on ya mates always remember to cheer them up with a simple mata usi
Moses : "Damn, I saw what happend, mata usi?"
Tevita : "Yeah faka'apa'apa uce"