When you are having doggie-style sex with a girl and you pull out and stick it in her ass. When she turns around in suprise, you punch her in the face!
The current definition of a Donkey Punch is wrong, highly inaccurate, and can cause serious injury and criminal charges to anyone who tries it. It's also a Myth.
What an ACTUAL Donkey Punch is, is a punch delivered to a woman’s ass during intercourse. It's like spanking a woman's butt, but with a closed fist instead of an open hand.
Woman: (Squirms in her chair)
Man: Are you alright, honey?
Woman: No. That Donkey Punch from last night was too hard. MY ass still hurts.
Man: I'm sorry. let me get you an ice pack, and I'll be a lot more gentler to your ass next time.