We found 4 dictionaries that define the word blue ball:

General (2 matching dictionaries)

1. blue ball: Merriam-Webster
2. blue-ball: Wiktionary

Slang (2 matching dictionaries)

3. American-Australian Slang Dictionary (No longer online)
4. blue-ball: Urban Dictionary

Phrases: Big Blue Ball, more... ▸ Words similar to blue ball ▸ Usage examples for blue ball ▸ Idioms related to blue ball ▸ Wikipedia articles (New!) ▸ Words that often appear near blue ball ▸ Rhymes of blue ball ▸ Invented words related to blue ball