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1.
A reverse boner. The act of being immediately and exceptionally turned off. Pronounced "rah-boner"
Boyfriend: "When my girlfriend farts, it gives me a reboner"

Or

Girlfriend: "My boyfriend's Movember mustache gives me a reboner"
by CharlieMurphy13 November 21, 2010
 
2.
Getting a hard-on too soon after cumming, and requiring you to punch your dick until it gets soft again, to avoid priapism.
"Shit man, I jerked off twice today, and my dick just got hard again. That re-boner shit ain't good for you, so I did a little preemptive strike with some fridge door slams. Problem solved."

"Uh. Word."
by zombieskin October 13, 2011
 
3.
the fall of one erection after climax which then gives rise to another erection
Julba: "Hey Luke and Elliot, do you guys ever get done fucking your girlfriend, but still wanna have more sex?"

Luke: "Yeah dude, but the hardest part is getting a reboner, sometimes it takes like four minutes!"

Elliot: "I wanna put my reboner in a big bowl of puddin"
by Julbasaurus October 05, 2010