The face one makes when they hear a really funky song or a really funky beat/bass line. The reason for the use of the word doodoo is that it's a face similar to when you smell doodoo (feces), and also is related to how "dirty" the song/beat/bass line sounds.
This is the term as defined by the band Wallpaper and is the meaning behind the title of their song and album by the same name.
Watch out, that Parliament song will give you some serious doodoo face.
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