In the Justin Bieber Roast on Comedy Central, Justin remarks that Natasha Legero did not shoot out ping-pong balls like snoop promised. Can someone explain the significance of this? I don't understand the reference.
In certain establishments, notably in those areas with a reputation for bawdy licentiousness you can go to see live sex shows where a female performer will expel ping-pong balls from an intimate body part.
Justin Bieber was presumably claiming that he was promised such a performance (from Natasha Legero) in return for attending his roast, something he might not have otherwise done given how little he would enjoy it.
The joke itself is a variant on the classic "You said there would be x", "yeah, I lied" formula.