Smitty is also used for a nickname to call someone with the last name of Smith. Usually a male of the smith family.

Mr. Smith says: Hey neighbor how ya doing today?
Neighbor say: Not bad Smitty. You?
by SmittyB. November 9, 2006
Nickname for someone with the last name Smith.
Some guy: Hey, Smitty.

Smitty: Hey, some guy.
by Tim Jerome March 19, 2008
To cancel on someone at the last moment, often without notice
I can't be bothered to go tonight, I'm just going to Smitty this one out.
by DaveOUK November 17, 2008
The most American title a Smith can be bestowed. This was created when a certain sect of the Smith family that formed in the early 1900s after an extremely American boy was born to an extremely American family. He had many children, the oldest of which passed on this nickname of Americanness and passed it down to his son, who had earned the title at only fourteen. Many claim this title, but there is only one Smitty family.
Andre: Wow, Smitty's so American. He does things normal people find fucked up and isn't afraid of admitting it.
by TheDanzanator March 27, 2010
Fucked upppppppp
Yo, lets get smitty and go skinny-dipping in the bathtub.

I'm pretty fucking smitty right now.
by Tooly McToolerson July 20, 2010
Slang name for the 1st or 2nd mate on a pirate ship.
Arrr Smitty, bring da slaves to da deck before they walk the plank. ARRRRR! (Yo Ho, Yo Ho)
by Pirate1234 February 7, 2011