when a female gets so wet that you can see it through her pants
Damn! Did you see Jessica in our last class? I could tell she likes the substitute teacher because she had a mean water pocket.
Basically it's someone who always has really sweaty hands.
Example 1:
*Guy 1 has water pockets*
Guy 1: Nice to meet you!
*They shake*
Guy 2: Eww water pockets
Example 2:
Jerry is at Jed's house and they're playing Xbox. Jed hands Jerry the controller and its all sweaty and slippery. Jerry now knows that Jed has Water pockets.