This is a meme that is based around current FaM World Heavyweight Champion : 2 Twisted Merk.

People have said that as a day job, 2TM is a mailman and therefore, he has been given the name: 2 Twisted Mailman. However In the April 29th Livestream it was confirmed by Merk himself (Who To the suprise of the chat joined the stream) that at one point He Was A Mailman.