Etymology: combination contraction of obsessive and sissy
Adj., Tending to engage in unwelcome posting, replying, and borderline stalking on various internet forums, in a cowardly and repetitive manner intended to circumvent attempts by others to avoid that behavior, suggesting a psychological inability to control personal behavior.
N., one who engages in a cowardly style of needy, repetitive harassment driven by a juvenile need for attention, usually involving the use of many aliases intended to avoid the killfiles of decent people.
Adj. - He's the most obsissive abuser of Usenet I've ever seen.
N. People decided to ignore the obsissive stalker, who eventually melted down from the lack of negative attention and crossed the line.
related term narcisissy