from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A problem with a low level of difficulty.
Derived from the idea that trained monkeys can do low-level jobs, working for bananas. It also may come from Sherlock Holmes lore. In one story he told Watson that the current problem was "quite a three-pipe problem", meaning that he would have it solved after smoking three pipes. (Wiktionary)