"Hit 'Em Up Style (Oops!)" is the debut single by American R&B singer Blu Cantrell, written and produced by Dallas Austin and featured on Cantrell's debut album, So Blu (2001).

It is Cantrell's most successful single in the U.S. to date and her only single to enter the top forty of the Billboard Hot 100 so far, peaking at number two (where it spent two consecutive weeks) on the issue date of July 21, 2001 behind Usher's "U Remind Me" (Cantrell would appear on the remix of the song). It enjoyed similar success in Europe and Oceania. The song appears in video games Donkey Konga 2, Singstar as DLC and Just Dance 4.

The lyrics propose that women should take revenge on cheating men by draining them of their available assets, both monetary assets and property. Cantrell has said that she did not particularly care for the song artistically, but the bitter feelings she was experiencing at the time led her to include it on the album anyway.

"Hit 'Em Up Style (Oops!)" is written in the key of F minor and is written in half time with a tempo of 90 beats per minute. The song features the chords Fm and B♭m6, and Cantrell's vocals span from B♭₃ to A♭₅.

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