Used in regard to hair and its maintenance procedures, whereby one sustains their natural or artificial curls.

Though often said by males, females can also "keep it swimmin" with little or no change in connotation.
Angela: Damn, Marcus, your hair looks tight. You going to the ball?
Marcus: Nah, girl, I'm just keepin' it swimmin'.
by alex_trebek June 19, 2009
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