Usage of the phrase "We have been made."

Solution 1:

This usage of "made" is considered slang, specifically as used by criminals, police, spies, etc., but I would say that it is very well known to native speakers. The Oxford English Dictionary notes that it is originally American, but I believe that it is now also used outside the US. This usage has been common in American movies and television shows for a long time, so perhaps it spread that way?

Here's what the OED says:

52. trans. ... f. Criminals' slang and Police slang (orig. U.S.). To recognize or identify (a person, etc.). Cf. make n.2 10.

The oldest example given is from 1906. The reference to "make n.2 10" is to a similar noun form, meaning an identification or profile.

Solution 2:

Have been made ( slang expression):

To have your cover blown, that is, to have your real identify revealed. Applies to undercover police, secret agents, spies or moles.

• we have been made = we have been found out. = we have been discovered = they know about us, etc...

• "Get out of there, you've been made!"

Source:http://www.urbandictionary.com/define.php?term=made