Let me also add "εγώ είμαι από χωριό", not exactly equivalent but still used when someone tries to impress or to evade responsibilities using complicated language, a phrase which goes back to άγροικος ειμί την σκάφην σκάφην λέγων, used by Philip of Macedonia.
Also, αυτά μας τα 'πανε πολλοί, μας...