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Male sperm cells.
Last night I was laying in my bed masturbating.

I finished off with a kleenex full of little swimmers.
by Yahoo! Answers Phil J January 05, 2009
Young children who invariably wander in to a pool and drown each year during summer months.
I was reading the paper and saw we had our first little swimmer of the year.
by Charles Sm1th October 21, 2011