I watch a film named "Leon".
One person will kill other person.
That person say : "We got company!".
I can't understand!
I think he should say "We have problem" or "We are in trouble ".
why he say "We got company"?
"Company" in your example means other people.
So, if in a movie, someone says "we have company" it just means that the suggested party isn't alone, or that they are in some sort of danger that is influenced by another person/people.