The act in which a tube is shoved into a man's ass and a gerbil let loose inside. The bewildered animal will crawl through shit and eventually tickle the man's A spot, sending him into orgasm. A gerbil may later be extracted by shining a flashlight into the rectum. Note: Always wash your gerbils.
Anyone cruel enough to subject an innocent animal to interanal gerbilation
needs to be shot.
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A situation, person or thing that is even more anal.
A: I got a D for math...
B: Didn't you already fail the midterm?
A: Yup... it's interanal.