The usual definition: During anal sex the man punches the woman to tighten up her butt.
The untold rendition of 'donkey punch': A guy is having sex with a girl doggie style (vaginally). Without a single warning, he pulls out and puts it in her butt. When she turns her head around to say 'what the fuck?', he socks her in the back of the head and she shits on his dick.
Have you heard the new way to break up with a girl? Ya, it's called 'donkey punch'. Cuz then you can tell everyone she shat on your cack.
When you are fucking a chick doggystyle, donkey punch yourself, knocking yourself out. Going for the double knockout, fall face first into the back of the chicks head knocking her out, while still inside her you both fall to the floor.
"Louis and Tara both have concussions from that donkey punch knock out they performed lastnight."
the act of breaking out in raucous laughter while performing doggy-style sex on another person.
Joe: Hey, Steve! How was your date with Cindy last night?
Steve: It was swell until she got mad and left.
Joe: What happened?
Steve: I was performing doggy-style sex on her, and then i noticed her NKOTB tattoo on her ass and donkey rofl'd.
When a donkey comes up behind you and buttrapes you until he fills your rectum with his donkey semen while braying in your ear like some autistic child having a seizure. Causes immense pain (or satisfaction, if you for some reason you enjoy having your buttcheeks torn by a wild animal.)
Bob: Hey man, ready to getdonkey schlonged by this math test?
Joe: Yeah dude, Mr. Rogers is gonna rape us so hard.