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1.
A swumpkin is the offspring of a Frankenstein swede and a pumpkin. It is about 3/8 pumpkin, 3/8 swede and 2/8 Frankenhuman.
"Hey. I'm a swumpkin!" said the pumpkin-swede-Frankenhuman baby.
by HappyHappyHipposHealHangovers March 07, 2011
 
2.
Another word for "FOPA"
Swumpkin is the swollen area of the lower belly that resembles a pumpkin.
"Did you see that swumpkin?"
"Yeah I totally want some of that"
by Felix Tripp January 30, 2007