Definition from Wiktionary, the free dictionary
ネカマ (romaji nekama)
- (Internet) A kind of internet sock puppet used on dating and personal sites, specifically a man who posts a personal advertisement using a female identity.
- (etymology) Parker, Ginny. "Dating Game: Looking for Prince Charming? In Japan, check your cell phone". June 4, 2001, Vol. 157, No.22.