How to stop a 20 month old toddler from cursing?

My 20 month old daughter is very smart. has been speaking full sentences, conversating back and forth for several months now. I love her very much & am proud of her and how advanced she is but its frusterating, because she has now gotten to the point where she will cuss. Yes its embaring, that she has picked this up, but my question is how do we get it out of her memory all together. we have made a pact to never again cuss and try very hard not to raise our voices since she picks up everything. Its scary. She will have a temper tantrum and then right in the middle of screaming and crying she will stop all together and just scream the F word or "Shut up". She also will hit and try to bite anyone near her. I know the best thing to do is ignore this behavior but its so difficult and seems to only make her more upset. this happens several times throughout the day. She'll drop something by accident and say the S word or "D***it". She knows all the curse words, and the right context.