The act in which a male inserts two or more fingers as far as possible into a woman's vagina, then pumps the fingers back and forth vigorously until the female blasts her sweet poonani juice all over the landscape.
See also: Crimson Switch
Dave: How'd it go with Lisa last night?
Lurch: Great, I spent a hot minute fingerblasting that shit.
Dave: How was the cleanup?
Lurch: It was okay, mostly got on my face.