From Adult Swim's "Black Jesus"

[Wilson Gray]

"You're going to get you *pounds* of marijuana, baby! I'm talking about
_*elbows*_!"

The UD has

"elbow : a pound of marijuana"

from 2002.

An obvious extension of the common pronunciation of the abbr., "lb(s)." as
"L B('s)."

(My lady wife prefers "lib(s)," which I know as "Librium(s).)

-- 
-Wilson
-----
All say, "How hard it is that we have to die!"---a strange complaint to
come from the mouths of people who have had to live.
-Mark Twain

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The American Dialect Society - http://www.americandialect.org