The act of purposefully sabotaging someone in an onlinegame for no particular reason, specifically in non-competitive games where the goal is not to eliminate opponents.
"Oh man, I was doing so good but then this guycame out of nowhere and parped me, now I lost!"
usually associated with emmo, although this is not through emmos own fault. The nooper came up with this marvy terminology, and tends to use it an awful lot.
*holds nose and rasps violently* 'did you parp AGAIN? emmo? did you?'