This is when a girl gives oral sex on a soft penis. It does not refer to continuing to suck after ejaculation, but sucking the soft penis from start to finish. She will swallow all the pre-cum, but a full ejaculation is not likely to occur.
I can't get hard because this girl is a trash bag titty whore, but I'd still let her soft blow me.
by esteban de queen February 20, 2011
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Failing to achieve erection before ejaculation. Often painful and leads to feelings of shame and inadequacy.
The experience of wearing a G-string caused Derek to soft-blow. What a n00b....pwned!
by Giner December 24, 2003
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