This can only be performed by the uncut brothers. When the foreskin is stretched upward to make what appears to be a small cup and is then filled with what ever liquid is desired and Swedish fish are placed into the “pond”.
“Mike send the boys a pic of your Swedish koi pond!”
Mike: “I lost one in there from last time!”
A highly specific (possibly true) excuse for taking a very long toilet visit. Suggested use is mostly for incidents involving defecation.
"Hey guys, I'm back on stream! Sorry I was gone so long, I tried to hurry, but I was Fixing the koi pond... The pump was clogged and I had to clean it out!"