its hacker/gamer talk...
examples:

b => 8
c => ( or k or |< or /<
d => <|
g => 6 or 9
h => |-|
k => |< or /<
p => |2
u => |_|
v => / or \/
w => // or \/\/
x => ><
y => '/

It's physically impossible for you to lick your elbow when intact to your miserable body.