Originally an experiment demonstrating the principle of conservation of momentum, Newton's balls are five metal balls suspended in line by fine wire or string. When one ball impacts the rest, momentum is conserved and the ball at the other end is knocked into the air.
Alternatively, Newton's balls can be used to describe a sexual situation. When two men engage in anal sex in the doggy style position their balls slap together, creating an effect much like that described above. Gay people often feel that such a situation is baroque.
"Bastian and Gabe got the Newton's Balls effect happening last night, I could hear it from next door!"
A meme that's been around since Lemmy was introduced to Mario Maker 2. A YouTuber named Smashy then used it as a pun in his Mythbuster series. Lemmy's thrown balls are literally indestructible, not even Yoshi can eat them. Its only weakness is a fucking wall.
A: Hey, you see that Lemmy over there?
B: Yeah, let's touch Lemmy's balls haha.
A: Good idea.
A way of saying "yeah right" or trying to say something's never going to happen because it sounds so rediculous. Synonomous to "when hell freezes over"
Derek: "Hey Dan can i borrow your car tonight?"
Dan: "No"
Derek: "Come on dude please. Won't you ever trust me."
Dan: "Hell no. I'll trust you when Justin Bieber's balls drop."