Overly funny; something humorus said that takes you on a laugh-your-ass-off thrill ride. Or what only sounds clever, and your just laughing because you have no clue as to what is going on.
Amy: "...And like then, my girlfriend says, 'Like sure, but ice cream melts faster!' And it was all, like, TOTAALY FUNNAY!"
Gretchin: "Uh....Oh. LOLLERCOASTER!"