I'm going to punch my sister in the traps
Why are you going to punch your sister?
Her traps (abdominal muscles) because she always acts like she's such a boss.
There is no reason to punch your sister. If she is acting in a way you think is wrong, then communicate that to her. Punching her is very rude.
That's some shit you're talking. Jesus, I'm so fucking mad.
It is ok to be mad about how she acts. But punching her is going to compound the problem and not solve it. Talking it out is the better way to do this.