Bunned, as an adjective, means retarded or damaged in general; can be used to describe everything from technology to people.
As a verb, to bun or to be bunned is to screw or be screwed over in a negative connotation.
Person 1: Did you hear Ollie bunned his phone?
Person 2: Dude, Ollie's bunned. He'd bun his phone eventually regardless of circumstance, he's just so spaz
A riddle that will make your life complete once solved.
Cole: Chili on the bun
Joe: What is that?
Cole:A riddle that once solved, your life will never be the same.. in the best ways possible
A ponytail that on the last pull through the rubber band you stop halfway through and it is a hanging bun. Cuter and more modern than an old fashioned bun.
"Girl your pony bun looks so cute"
Laying on top of a girl with your penis smushed between her butt cheeks for extended periods of time
Bro, me and my girlfriend were bunning for two straight hours last night while she scrolled reddit.