Top Definition
One who copulates with several women. Much like a sailor goes place to place, a tunasailor sails from "fish to fish" or woman to woman. Has no standards whatsoever in where he sails.
"Did John stick around for the afterparty?"

"Are you kidding?! That tunasailor is probably on his second fish of the night!"
by msumaltman December 23, 2007

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