The point at which you first piss after you have been drinking your favorite alcoholic beverage and at this point you will be pissing every ten minutes. See 'break the seal.'
I can't hold it anymore, I have to go open the floodgates.
Verb-To bring forth an epic revolution of social justice and freedom of culture.
MAN: God, society is in hell, the impious rule the streets and devils rule the heavens1
GOD: Stand back, for I shall open the floodgates
When two men who desperately need to urinate press the heads of their penis's together so that the tips touch each other and let the golden stream flow into the other's shaft-hole.
A variation of this is when neither party involved has been circumcised, and both foreskins are stretched out to be pressed together. This may be referred to as "Bursting The Flood Gates"
Chris: "Hey man, you bustin'?"
Chris: "Wanna go Open the Flood Gates?"
Bruce: "Hey Abraham, wanna go Burst the Flood Gates with me?"
Abraham (shakes head): "Sorry Bruce, I'm Jewsish."