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It is a replay not a sample of SWAY popularized by Dean Martin
Kaliko is singing the hook.
From wikipedia: "Sway" is the English version of "Quien Sera", a 1953 Latin pop song with a mambo beat written by Mexican composer and bandleader Pablo Beltrán Ruiz. In 1954 the English lyrics were written by Norman Gimbel and recorded by Dean Martin (this recording reached #6 on the UK chart). Since then the song has been recorded and remixed by many artists including The Pussycat Dolls
Selective list of recorded versions
1950s - Pablo Beltrán Y Su Orchestra
1950s - Perez Prado
1953 - Eileen Barton, on Coral Records, catalog number 61185, backed with "When Mama Calls"
1954 - Dean Martin, UK #6
1960 - Bobby Rydell, UK #12
1960s - Julie London
1961 - Ben E. King
1967 - Cliff Richard, from his album Don't Stop Me Now
1998 - Anita Kelsey, from the film Dark City
1999 - Shaft, titled "(Mucho Mambo) Sway"
2003 - Michael Bublé
2004 - Pussycat Dolls, from the film Shall We Dance?
2004 - Arielle Dombasle, titled "Quien Sera (Sway)"
2004 - diam's, sample in the title "DJ" (with French lyrics)
2005 - Aaron Kwok, titled "飛" ("Sway" - Cantonese version)
2006 - The Puppini Sisters
2007 - Jennifer Lopez, recorded in 2004 for Shall We Dance? but replaced by the Pussycat Dolls' version. Due to be released on Lopez's album Como Ama Una Mujer
Retrieved from "http://en.wikipedia.org/wiki/Sway_%28song%29"