Stands for "Pa La Pinga." It is a way for people of hispanic descent to express an extreme lack of care for something. In other words, it is the Cuban version of "Fuck it." The abbreviation is usually not said verbally, it is mostly used on the internet. The verbal version is the full "Pa la pinga!." It is usually screamed in an excited voice.
Nick: Bro you're on Accutaine you cant drink!
Bernie: Pa la pinga! Tequila shots on me!
AP Student: I just studied six hours for my AP Art History test tomorrow and I still don't remember shit. Who the fuck is caravaggio?! *Closes book and throws it off desk* "Pa la pinga!"
*on a college discussion website*
I got a perfect score on my SAT, but Ivy league is too hard. I'm going to Flagler College! PLP!