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To pull a Keller is a swimming term that means to jump off of the starting block and land on somebody who is already swimming.
Person 1 is up on the block, ready to dive as Person 2 comes in towards the wall.

Person 1 prepares to dive, but Person 2 does a flip turn instead of touching the wall, meaing they have another 50 or more to go.

It's too late for Person 1 to stop, and he falls into the water on top of Person 2.

Person 2: "I still had another 50 to go! Way to pull a Keller and get us D.Q.ed!"
by The Last Cowboy June 04, 2009
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