As for the song itself....it was very popular when I first started working at Myrtle Sporting Goods, and it was mildly annoying but overall inocuous--save for one thing. Throughout the song, according to posted lyrics, Amerie chants 'knock, knock, knock, oh.' However, everyone who worked at the store, including me, kept hearing it as 'gobblegobblegobble.' It used to crack me up hearing this woman start acting like a turkey in the middle of this girl-power-guy-diss standard pop-fluff. And apparently we weren't the only one; I vividly remember hearing an interview with this woman on Z-100 here in New York where she vehemently denied that she was gobbling.
It was one of maybe three times I ever actually found the reprehensible Z-100 funny.
You'll notice, incidentally, that in recreating this timeless....well, timed, classic, Elbow chooses to go with 'gobblegobblegobble' instead of what Amerie claims she was singing. And that warms my heart all the more.