The phrase "hot dogs" is an idiomatic expression that means to work very hard or to put a lot of effort into something. It can also refer to someone who is boastful, overconfident or pretentious about their abilities or achievements. The origin of the phrase is unclear but it may have come from the fact that hot dogs are quick and easy to eat, so when you work hard at something, people might say "he's really working up a sweat, he's just chomping down those hot dogs!"