(v) getting wild or excessively crazy. Typically used in the context of a party.
It is normally followed by a prepositional phrase (For the party, In that place, On that hoe) and it is often used in the past tense (turned up). "Turning up" is almost never said.
As far as I can tell, it is the 2011 equivalent of what Getting Crunk was in the early 2k's and late 90's.
We turned up in Mr. Mitchell's class when he had a sub last week.
I turn up every weekend.
Prices shown in USD.