 The song opens with an introduction which consists of eight measures of instrumentals , followed by eight measures in which Akon sings " Woohoo , yeehoo " . The introduction has been claimed to be similar to that in the 1986 song " Sweet Sweet Gwendoline " by German band Die Ärzte . Overdubbing is introduced in the middle of the first verse to produce a sequence of eighth note B ♭ minor chords from Stefani 's vocals . Stefani 's voice is overdubbed again when she sings the chorus twice . Akon performs , and Stefani then sings the second verse and the choruses again . She returns to the latter part of the first verse and repeats the choruses . The song closes as Akon repeats the lines " Woohoo , yeehoo " and " I want to get away to our sweet escape " as the song fades . 
