The act of getting a blow job while taking a shit on the toilet inside a Porta-Potty. Very similar to the plain BLUMPKIN. Just watch out for the blue water.
Why don't you come inside this porta potty and give me a Porta Blumpkin.
by Dominick AKA Snuffy September 02, 2007
Getting a blowjob while shitting in a porta potty
I was at this tractor pull in Tomah and got my woman to give me a portablumpkin.
by Susie Mccutchans December 02, 2006

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