When somebody is drinking milk and hears something so funny that they simultaneously spit milk out of their nose and poop themselves.
"Dude, John was drinking some milk the other day and I told a joke so funny that he shitmilgasmed!"
"Man... You just made me shitmilkgasm!"
"Man... You just made me shitmilkgasm!"
by Slaptastic Monkey Spanker December 06, 2014