How do I fake accent?

Now, as a non-native speaker, I naturally have this weird accent that somehow pops up sometimes among my tv-show influenced bland vanilla american accent.

The question is, how to fix that - and has anyone tried "learning" another accent? Might be cool to pretend you're an Australian sometimes.

i can do a pretty convincing american accent, but my mother is american. i can switch between the two and people tend not to notice that i'm not american.

accents can and should be learned though, practice with a native, ask them to point out when you say things wrong, correct it. be stubborn and perfectionist.