To help someone else, typically at their request. In this usage, the person being helped is stated between "do" and "a.
To do something to help or better oneself. In this usage, a reflexive pronoun Fremont outdoor sex used between "do" and "a. Because I Need a walkingyoga buddy to lose some extra pounds that I had to get up at 4 AM today, I did myself a favor and went to bed early last night.
A request for someone to stop doing something Grandin sexi womans or annoying. Can you please do me a favor and take your loud music somewhere else? I'm trying to sleep!
A response to a statement that the speaker finds ridiculous or stupid. Primarily heard in UK, Australia.
A: "Katie seems nice. Would you please do me a favor and take this letter to the post office?
My neighbor did me a good turn by lending me his car.