Upon seeing the actual populatirty of the joke language known as "ultra 1337" I've decided to start thrad on it! (Sure why not)
Here's my personal translations of the letters:
A - 4
B - |3
C - (
D - |)
E - 3
F - F (or |= but nobody can understand that)
G - 6
H - |-|
I- !
J - _|
K - |<
L - |_
M - //
N - ||
O - 0
P - []D
Q - 0,
R - |2
S - 5
T - 7
U - |_|
V - /
W - //
X - ><
Y - Y
Z - Z
//007! |_||_7|24 1337 []D//||5 Y0|_| |_1|<3 4 ||00|3!!!