Jizzblast, mainly used in porno's, describes when a man sprays his hot load i.e. ejaculates, all over their partner, usually on the face or titties.
Oh dear, you've jst jizzblasted in her eye. No she's blind!
When a guy drops his creamy load so fast that it's direction becomes hard to control.
Damn, Ian jizzblasted so hard he hit his dog, and then the dog licked it up, and then he did it again coz it was pretty damn funny.