A parasite Single is someone who is single, no plans for marriage any time soon, not dating, still living with parents. Most parasingles don't quit this lifestyle until their late 30s, early 40s.
The term started in Japan, comming from a 1997 Japanese horror movie Parasite Eve & backed up by best-seller book by Masahiro Yamada in 1999.
by Allaiyah June 24, 2004
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