Top Definition
This happens when you are taking a bath and you blast a dirty fart. A bubble will form and when it releases to the surface head for the hills. This is worse than the dutch oven, especially when the water level in the bath is only partially above your butt hole.
My girlfriend left me because when I layed a hydroblast she passed out and drown. RIP.
by bootycrack29 February 07, 2009
5 Words related to hydroblast

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