To pull a Marta means to leave someone on read for 10+ hours while leaving the other person in total dispair. The term had it's origin in a romantic context but is also commonly used among friends.
exemple of "to pull a Marta" in a conversation:
person 1: wow I'm so sorry, i overslept and forgot to reply to you...
Martin and his girl watching tv. Martin wants to make out, Martin pokes her face over and over with her trying to ignore him. He has thus Pulled a Martin