This exclamation is looped and repeats every 2 bars in the background as part of the instrumental. Pharrell often makes vocal appearances in songs that he produces, whether singing or rapping, and it’s not uncommon for him to loop adlibs in this way
The “woo” sample is likely inspired by Michael Jackson’s famous opening cry in “Don’t Stop ‘Til You Get Enough”.
To help improve the meaning of these lyrics, visit “Blurred Lines” by Robin Thicke (Ft. Pharrell Williams & T.I.) Lyrics and leave a comment on the lyrics box