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1.
One who constantly and furiously masturbates into his webcam while on chat roulette.

Credit to Ashley
"Yeah, tonight chatting I've met about 6 tools, four lonely guys in the dark, and three phantom jerkers."
by psycho_gerbill22 on AIM March 14, 2010
 
2.
one who subconsciously while sleeping jerks off their partner who is also sleeping.
KG (the Phantom Jerker) Phantom Jerked JP
by muskadusa December 22, 2009