gaga'ed
Copying someone's work and pretending it's yours, or living their life like you're their twin and they're your ghost.
I copied my friend's essay and got an A and he got a D and he said 'you're a thief'.
My sister took over my life and pretended she was me for a month and I had to fake my own death.
I stole my brother's identity and got into his school and now he's trying to get me expelled.