One's derpish doppleganger.
Derprah (Derpin' Oprah) would be Oprah's derpleganger.
by miknight December 06, 2012
The owner of an email address that's only a character or two different to yours who constantly gives your email address to his contacts.
My derpleganger gave my email address to his tax auditor. AGAIN!
by krimhorn February 28, 2014