When ones penis is no longer erect, possibly either after blowing ones load, or just losing an erection. A semi-boner is often used for playfully slapping ones friends in the face while they sleep for a hilariously good time.
To try and piss my friend off, I got a semi-boner and helicoptered it around in his face.
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The act of two boys getting their peni erect and fighting with eachother. Normally the winner is the first one to go limp or in rare cases the first to blow his load.
my friend challenged me to a saber fight, and i could not be a coward and back down.
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