To me, Flo Rida is like the Train of hip-hop. It is void of anything special or noteworthy but at the same time, it's so harmlessly bland that if you heard it on the radio, it wouldn't come off as something so bad you need to vent about it. Maybe you'd change the station out of boredom but it wouldn't inject a leech on your brain. I'd even say some of his tracks, mainly "Club Can't Handle Me", had some sweet hooks/production on it (probably because he had absolutely nothing to do with it). Because whenever he does a song by himself (Fucking. Fuuuuuucking Whistle) it's completely atrocious.
He didn't write the hook to whistle. It was a submission to Mike Caren, Pres of A&R for WMG who liked it, gave it to flo and brought in producers to build it up from scratch.
Song is a smash, btw.