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2.
Where a woman is taking a fat ass shit, whilst she is being eaten out. Similar to the Blumkin but the roles are reversed.
Come on in here baby and give mama a grumpy munchkin. Don't let that tongue slip!
by D-Dogg77 January 28, 2010
 
1.
A woman whom is taking a dump sitting on the toilet, while at the same time has a man standing in front of her for whom she is providing oral pleasures
The woman taking a shit became a grumpy munchikin when i dropped my dick in her mouth.
by hollowbob September 09, 2004
 
3.
Much like a Cleveland Steamer or a Hot Carl, except instead of shitting on your partners chest, you shit on their forehead
My girlfriend said she wanted to kink it up in the sack so I gave her a grumpy munchkin last night.
by munchkinator January 11, 2010