Hubba hubba (interjection)– used to express approval, excitement, or enthusiasm, especially with regard to a person’s appearance
“Look at that hottie, hubba hubba.” The exclamation has its origin in the 40’s and is now almost obsolete. Some say it came from the Chinese greeting hao bu hao while others think it sounds like heart pounding through chest from excitement. A 1961 paper published in American Speech argues that the Chinese connection is a misconception. Conclusion: origin unknown.