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When one (usually a male but we are not going to be gender specific here) is into the music so hard the get a spontaneous boner.
"There I was at Coachella, letting a bitch know in the Sahara tent, when *BOOM* jamboner!"
by sahara$4wankers May 29, 2013
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When high on opiates and are "jammed", and you can't control your erection.
Even with the nausea my jam boner won't go away.
by Fillcolons October 04, 2018
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