in the most desirable position; most important; best; most competent; most desired; having the best reputation for success. The people think that what we're doing is unreal, but we know the substance of their unreality, which of course makes us top dog every time. -The Itsa Line (20 Aug. 63)(slang) the one in the most desirable position; the most important; the best. That is the top dog, right there. -Briefing of Review Auditors (14 Oct. 65)(slang) a person, company, etc., in a dominant or leadingposition, especially in a competitive situation.a person, group or nation that has acquired a position of highest authority.in the most desirable position; most important; best; most competent; most desired; having the best reputation for success.(slang) the one in the most desirable position; the most important; the best.the one in the most desirable position; most important; best; most competent; most desired; having the best reputation for success.