the phenomenon wherein one seems absorb the altered states of one's companions, and begins to display the behaviours typical of the chemical in question.
"hey, you're talking at a million miles an hour and dancing to the beat of a dripping tap... but you're the only one here who hasn't taken anything!"
"hmmmm... must be chempathy. HAVE A GLOWSTICK!"
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi