Urban dictionary entries 2004 for pizza:

http://www.urbandictionary.com/define.php?term=Ordering%20Pizza

http://www.urbandictionary.com/define.php?term=pizza&defid=871443&page=4

Pasta might be coca paste:

http://www.telegraph.co.uk/news/uknews/law-and-order/6521761/Drugs-slang-what-police-must-learn-I-to-Q.html

Hot dogs might be unsafe sex:

http://onlineslangdictionary.com/meaning-definition-of/hot-dog

A pizza/dog party becomes a sex and drugs party.

This is not to demoralize, there is still enough circumstantial evidence for child trafficking around.

But if we're really investigators we should be open to this possibility.