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3.
Someone who creates a specific smile gives a smilejob.
The smilejob on her face after she performs oral sex on him.

or

The regulation smilejob he or she always gives their bosses...
by Denis Jackson August 02, 2006
 
1.
When someone smiles for a very creepily long amount of time until the other person freaks out and there reaction is unknown.
The purpose of this is to see peoples random reactions to get a rise of laughter from you and your friends.

"I just gave that old man a smile job from a across the room and he winked at me!"....*hysterical laughter*
I just gave that small child a smile job and he made a stupid face at me!
by thesaminator17 October 10, 2010
 
2.
A blow job from a woman with a very large gap between her front two teeth. Also known as "falling into the gap"
"That bitch in the alley has large buck teeth that a smile job from her just ain't worth it!"
by Adrienne Levy and Sy Islam December 07, 2007