1. "I doubt it."
When someone says something you know is complete bullshit, you shout out "chances!" to call him or her out on it and/or embarrass that person..
2. "No chance in hell"
A very rude way to say no.
1. Dumbass: "Last night was amazing. I met a pair of gorgeous, tall, blonde Swedish twins at the bar and fucked both of them."
Sane Person: "Chances!"
2. Loser: "Um, so, do you wanna go to prom with me?
Incredibly Hot Rude Girl: "Psh, chances," and walks away.
when something near impossible happens that wasn't even attempted.
the pro-line commercials.
whoa i just threw a football and it went in the basketball net