Claim: The Black Eyed Peas performed a single.

`` Imma Be '' is a song performed by the American hip hop group The Black Eyed Peas taken from their fifth studio album The E.N.D. . The song 's title is a slang expression , meaning `` I am going to be '' or `` I will be '' -LSB- something or some activity -RSB- . Initially released as a promotional single , the song went on to receive a full release as the fourth single in the United States and Canada from the album , the fifth overall , and is the third single from the album to reach number-one on the Billboard Hot 100 .   Critical reception to the song was generally positive , with some critics saying that it was a standout track from the album . The video for the song was filmed back-to-back as one collective clip , totaling ten minutes in length with `` Rock That Body '' which is the fourth international single from the album . The collective montage is titled `` Imma Be Rocking That Body '' . The song was part of the soundtrack of the film The Other Guys -LRB- 2010 -RRB- and was used in the bar scene . The song can also be heard in the film The Hangover Part II -LRB- 2011 -RRB- . However , it does not feature on the official soundtrack .