When it comes to their disagreement, it’s definitely not water under the bridge.

Police in Port St. Lucie, Florida arrested Giovanna Borge, 19, last month, after she shot her boyfriend of one year – with a water gun.

Borge claims her boyfriend said something that annoyed her, so she “took a water pistol and squirted him with water.”

From there, things got just plain ugly, not to mention wetter. The boyfriend dumped water on her and hit her with a pillow before they took turn pushing each other.

Police who were summoned to investigate the matter determined Borge was the "primary aggressor," so they hauled her off to jail for “squirting water...to antagonize and agitate him against his wishes."

Hey, it could be worse -- she could've assaulted him with grape juice.

[The Smoking Gun]