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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.
Soft-On by JohnnyPops February 17, 2009
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!!
soft on by Anonymous June 11, 2003
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...'
soft-on by Evil-Ernie May 29, 2003
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."
soft-on by Z.J. Henderson November 19, 2007
When you are attracted to a girl, but only as a friend either because she practices chastity or does not want to have sex before she marries. Can also be used for items that you like, but you don't love.
I have such a soft-on for Emma, but she only wants to be a friend.

Eh, Dairy Queen? I only have a soft-on for froyo tonight.
Soft-on by MrSinger186 April 27, 2011
a "soft-on" is when the male penis fills with blood but not enough that would make the penis begin to get erect. The penis swells - but there's no visible elevation yet.
I was thinking about this babe at school and the teacher called me to the chalkboard. Luckily i only had a soft-on so I could stand up and walk to the board without being embarrassed.
soft-on by belairjeff December 9, 2022