refers to a Latin sentence "veni, vidi, vici" - "I came, I saw, I conquered" by Julius Caesar - in this case it means "I came, I saw, I used Wikipedia" ("wiki" instead of "vici") and describes a tendency to look for solution to every problem or answer to any question in Wikipedia without considering any other source;
John: That's a nice essay.
Carl: Veni, vidi, wiki, bro!
Carl: Veni, vidi, wiki. I came, I saw, I used Wikipedia! I just typed the topic and I got all the answers. No library, no sitting with books till midnight. I conquered!