"Dude, take a picture of me while I do this massive bong hit! Don't worry, it won't have any effect on my image as an athletic idol to millions!"
I guess when you're in the throws of partying at some frat house in SC, it really doesn't occur to you that this might be an incredibly stupid thing to do around a bunch of people you don't know with cameras.
I also like how his response to the incident was basically the same as the one he gave when he got the DUI. Classy.