The act of receiving very tempting oral sex, commonly know as a blowjob, while expelling fecal matter on a toilet seat. It is common at most social gatherings such as house parties, where Mexican black beans are served, along with very erotic females walking around.
"Bitch, put that phone down and give me a blumkin!"
Sebastian gets a little cranky when his girlfriend refuses to give him a blumkin.
Kathy was forced to comfort Lewis when he was constipated by gently stroking his penis and giving him a blumkin.
I had a chalupa with extra spicy beans and I had to go release my stinky brownies in the potty room. I was having a painful struggle getting Mr. Poopie out, then all of a sudden Madeline came in. She grabbed my Mr. Wiggles and started sucking on it. At that moment, I realized I was getting a blumkin. Now I am popular just like the other douchebags in my 4th grade class.