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2.
To be in the process of being a chef;cook or clean
The boys were chefin while cooking the steaks
by Josh Ayers and Zach Johnson December 15, 2008
 
1.
To Do Chef like stuff, like cooking fresh meals from scratch, without actually being a qualified chef.
That is the other reason I like my Chefin cause I can cook really tasty food, healthy!
by dg83 July 15, 2011