When a male masturbates into a bucket for 2 months and then while fucking a girl throws it into her face. The bucket can have m&m's and other treats you would see in a McFlurry
Having sex with a girl that has a glass eye, as you pull out, rip the glass eye out of the socket and cum in her empty eye socket and replace the glass eye.
Tim: Hey you guys remember Tina?
Guys: Yeah...isn't that the bitch with the glass eye?
Tim: Yeah, I gave her the Mcflurry last night and she loved it!
Verb. The verb "to McFlurry" involves person with McFlurry, usually in fast moving vehicle, lauching said ice-cream through open window of another car on a hot sunny day causing massive internal mess and stickyness to occupants of unfortunate vehicle. The "McFlurryer" (noun), or perpetrator of the throwing act, traditionally speeds off, usually laughing manically.
"We McFlurryed some old git at the traffic lights last night, it was hilarious"