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1.
to place your fingers together tighly and folded in slightly (as in a concave form) and move the air from your crotch to your face (or towards others) in a scooping motion. Used after a good fart to either personally enjoy or to permit reaction from others. (see crease)

Cupping allows optimize personal enjoyment.
Did you crease? I saw you cuppin'
by Scott Whittle July 13, 2005
 
2.
Half cupcake, half muffin. Also known as a muffin with frosting. They are very delicious and good for making friends.
"Steve sure knows how to win people over with his cuppins!"

"This cuppin is so delicious!"
by TheCuppinMaster October 22, 2011