When you deliberately do something you know is potentially very dangerous in the heat of the moment, usually egged on or inspired by friends who are "bad influences." Usually you regret it afterwards ~ but even so, lets admit it ~ if you were taken back to the moment, you'd probably do it again.
The other night I took a pill some stranger gave me while dancing at the club. Usually I wouldn't think of doing something like that but I didn't want to seem uncool in front of my coolfriends and in the mood to try something fungerous.
An adjective typically used to describe Vampires, Werewolves, Zombies, girls who bite you, and any viciousanimal. It derives from the two words "dangerous" and "fang."
"Damn, that Jessica is Fangerous! She keeps biting randomboys!"
"Oh woooww, That Bill Compton is so fangerous, I love how he looks when his fangs are out."
Oh geez! It's a snake! Be careful man! Those things are fangerous!"