soft blow
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.
soft-blow
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!