It is "singing uh-oh on a friday night".
The basic concept of the song is just to represent herself as a down-to-earth ordinary girl in an ordinary world. I get the feeling that the "This is my body, covered in skin, not all of it you can see" line is a dig at women in music who use skimpy clothes and sexual suggestion to sell records, whilst she's not like that.
It is "singing uh-oh on a friday night". The basic concept of the song is just to represent herself as a down-to-earth ordinary girl in an ordinary world. I get the feeling that the "This is my body, covered in skin, not all of it you can see" line is a dig at women in music who use skimpy clothes and sexual suggestion to sell records, whilst she's not like that.