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1.
A greating exchanged by farmers.

This word really belongs in the rural dictionary.
What's growin' long pardner?
by Mandingoe May 23, 2004
 
2.
A greeting. Similar to, "what's going on?" -except different.
Hey Jack A. Zee- "what's growin long?"
Jack will say- "not much."
Jimmy will say- "why not?"
It's a classic greeting volley.
by James Karen Staycox August 01, 2003