I don't recall Justin using the word "tuchus" in SexyBack, but I also don't recall the following lyrics: "My crack is so fierce/Maybe I should get it pierced/ It rocks I can't stop it/It's like an extra pocket..."
Source URL:
http://www.tressugar.com/146691
http://www.tressugar.com/146691
Links:
[1] http://www.jibjab.com/jokebox/jokebox/jibjab/id/490998/jokeid/114234