What is 7h47?
7h47 simply means, "That". It is usually used by gamer and computer nerds to make their speech more interesting. The 7 is used as a "T" and the 4 as an "A".
"Zomg 7h47 was teh pwnz00rz, lol he n00b."
See 7h47, that, l337, h4x