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1.
Conn means someone is a bad ass. A Conn is always the life of a party, they also will not back down from a fight, and if you fight one you fight them all!
See that dude? He is a Conn dont fuck with him.
by KillerCobra February 03, 2010
 
2.
Used as both a verb and a noun, and generally referring to the operation of a vessel.
V: He was heading out of New London, conning the submarine down the line of navigation buoys.

N: He was on the bridge, and had been told by the Captain that he had the conn.
by Lawman October 17, 2003