Slang: Vulgar. a person with whom one has a sexual but not a romantic relationship.
See also friend with benefits.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
taboo, slang a person with whom another person has a relationship based on casual sex only
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012