An organized game played mostly on college campuses in North America. It is usually run by and for students living in a particular dorm or group of dorms near one another. The game may last from a few days to a few weeks, and it ends either on a predetermined date or when only one participant is still "alive." (The person or people still alive at the end are the winners.)
Kills are made in different ways depending on the rules laid out at an initial meeting. For example, a bop with an empty soda bottle, a squirt from a squirt gun, or even a hug may be used to represent a kill. Often, each participant is assigned a particular person that they have to "assassinate" in each stage of the game as long as they remain alive. Lists of still-living participants are often posted daily in a dorm lobby or on an RA's door.
Assassins generally doesn't have any sort of safe bases or time-of-day restrictions on kills, so participants can be tricked or trapped into a "deadly" situation at any time or place, from a mid day English class to a drunken 3 am bathroom trip. It can cause some paranoia, but is generally regarded as an interesting way to spice up dorm life, meet new people, and get involved in some ridiculous scenarios.
assassin: but whyyy?
dude: because i have a girl friend and dont slap random girl asses and masturbate to video game chicks... bye!
2) Adverb. To whoop some dude's ass with Kungfu grip.
Assassin is also a song by the rock band Muse, it is probably the heaviest song on their new album
Guy 2: "Just a sec, I'm listening to this awesome song by Muse!"