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The opposite of a hard-on; when a penis is not erect and its size is unpredictable.
I had a boner, but then I thought of Susan Boyles naked, and it became a soft-on again.
by Tikibarberfan March 10, 2010
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"Man fuck Donald trump, he wants to build a wall and don't pay taxes!!"
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A flacid (limp) penis. Antonym: hard-on. A soft-on is generally produced by a woman with absolutely no sexual appeal.
Rosie O'Donnel gives me a real soft-on.
by headbaker May 28, 2003
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The state of the penis in between the flacid state and an erection. The penis usually looks huge at this time but still soft.
Omg! Your penis is huge!

Oh I just have a soft-on.
by JohnnyPops February 17, 2009
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To completely drain the image of arousal from a man's penis. ie opposite to hard on
Man! look a t that stockers she just gave me the biggest soft on ive ever experienced!!
by Anonymous June 11, 2003
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From having a hard-on to being turned off by something sexually and having it go floppy..
'I was ready to go, then i saw her hairy minge and i got a soft on...'
by Evil-Ernie May 29, 2003
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an unexpected loss of an erection; opposite of hard-on.
"Things were getting pretty hot until Marcy farted; the smell gave me a total soft-on."
by Z.J. Henderson October 30, 2007
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