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Wiktionary
get busy

vb. 1 (context idiomatic English) Start working, usually in opposition to idleness. 2 (context idiomatic English) have sex

Wikipedia
Get Busy

"Get Busy" is a 2003 dancehall song by Jamaican dancehall reggae toaster Sean Paul, from his album Dutty Rock. The song was one of the many hits from the jumpy handclap riddim known as the Diwali Riddim, produced by then-newcomer Steven "Lenky" Marsden, and was the only song that never made the "Diwali" rhythm album on Greensleeves Records as it was more than likely a late entry.

Paul described it as "...mainly a party song. It's not all about smoking weed." "Get Busy" topped the Billboard Hot 100 for three weeks from 10 May 2003, preceded by " In Da Club" by 50 Cent and replaced by " 21 Questions" by 50 Cent featuring Nate Dogg. It was performed live on Saturday Night Live in May 2003.