look up any word, like ratchet:
 
1.
The sixth, seventh or first night of the week, depending on your religion.

Saturday night is the most important invention in human history. Saturday night is the reason most conflicts have been resolved and is responsible for some of mankinds most excellent discoveries.

Acceptable ways to spend Saturday night include going out to the cinema, drinking beer, watching the footy highlights with your mates, clubbing, eating kebab, beating the wife and/or kids, and spending a dirty night out. Unacceptable ways to spend a Saturday night include going to bed early and being ill.

Without Saturday night it is conceivable that the couple of protein strands that joined in the primodial goo to form Earths first ever life form would never have done so, and all life as we know it would not exist.

Several other good facts about Saturday night include that it's impossible to fail to pull a slapper, it's the only night apart from Wednesday that it's legal to dine in an Indian restaurant, it's my favourite night of the week and it follows Friday night.
"It's Saturday Night! Let's get ready to rumble!"

Jim: "What shall we do?"
Pete: "Well it is Saturday night. Lets drink beer, get a kebab and go home to beat the wife and kids."

"I'm so happy it's saturday night, it's my favourite night of the week."

George: "Hey Saddam, it's Saturday night. What do you say we forget all this silly sentenced to death nonsense and go to the cinema?"
Saddam: "Infidel."
by Jamie Douglas November 20, 2006
 
2.
Is a time when teenagers get together and hang or "chill"...but could also be a night were some people stay up till 5 o'clock talking about making eggs,teddy bears and pinto beans
Blake: it's 3am
MaryRose: so it is Saturday Night
by Sexylexi143 May 18, 2013