1. To be dead, refering to how ECG machines' little green line goes flat when someone is dead.
2. To kill someone, literally or figuartively.
3. To be retarded, metally challenged, stupid, dimwit, and/or dumb.
4. A game where people choke themselves to get the feeling equivalent to be high. Therefore, legally high. Also known at the Choking Game and Space Monkey(s).
1. "Doc, the patient hass flatlined!"
2. a) The marine flatlined the Iraqi terrorist.
b) "I'll flatline you if you tell my mom I got a 46 on my math test!"
3. "Did you just figure out that water is wet? Wow Flatline, you're a few fries short of a Happy Meal.
4. A lot of kids accidently kill themselves trying to get high while playing Flatline
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