Please help me identify this song from Tropic Thunder?

I believe that it’s “Low” by Flo Rida.

Also, at the end of the movie, he dances to “Get Back”, by Ludacris.

This is what you should do the next time you find yourself in a similar dilemma:
Had to amend my answer, because I am slow and Chad is fast. Damn you Trigger Finger Chad.

- Take a look at the soundtrack to the movie. (Thanks, Wiki!)
– Pop each of those songs into some site like YouTube or Songza.
– Match it up to what you recall and that might solve your problem.

In this case, it was not on the soundtrack. But it was still listed in the article. Nice!.

I’m sorry Nimis! We can still be friends, right?

I guess I can forgive you.
Just this one time.