look up any word, like sparkle pony:
 
1.
Beer pong with hard alcohal. (horrible aftermath)
"Yo! We're out of beer for pong!"
"Fuck it, lets use this gallon of gin!"
"That sounds like a bad idea."
*2 hours later*
"Dude who fucking shit on my iPod."
by Phill Roth February 05, 2006
 
2.
A "Bad Idea" is when someone puts a light bulb up your anus, then breaks it by kicking you in the ass.
-"Hey man, why you in a wheelchair?"
-"Last night I had a "Bad Idea"
by Illestrader November 14, 2007
 
3.
a term used by arnold schwarzenegger in the film "predator" just after he punches the predetor in the face. quite funny.

see also ugly mudda
bad idea.................
by the cool 1 known as stu November 08, 2004
 
4.
Eating a girl out on her period. See also Spaghetti Take-Out
Man, what a bad idea
by Kirby Riot (Big Jillie) November 24, 2004
 
5.
(noun) A person who having any sort of intimate contact with is looked badly at by everyone on the planet ever. (And if anyone disagrees they're psychotic). Someone who no one should ever get with. Not neccesarily ugly or smelly, just all around not right - more based on social habits.
Don't get with Bob, you know he's ALWAYS a bad idea.
by tclcttb May 29, 2005