My mother used to say it -- I think it means "come out outside" as in "Yo-yo Elizabeth". They didn't have mobile phones back then, so as kids they'd just yell this from the outside of the house...
Not sure what you mean. There are lot of websites including funtelligenttoys.com that can help you out with the yoyo.
A popular slang term for leaving in the 1950s was "split," as in "Let's split this joint."
It means "Come Back".
"Don't sweat it" was a slang expression in the 1950s that meant "not to worry."
"50 slang" could refer to slang from the 1950s (such as "cool cat" or "greaser") or slang that originated in the area code 50 in Minnesota. More context would be needed to provide a specific answer.
A Yank tank is Australian slang for an extravagent American car, or United States slang to a pre-1950s American car in Cuba.
Super yoyo means taking a special kind of yoyo and swinging it properly so it swings back and forth without whacking the person holding it. It is quite hard to do.
If you mean slang as in internet slang, then it means "Certified Old Fart".
Fake Out is 50's slang for a bad datejacketed: dating only one person was also called "going steady".
Duncan yoyo's are a brand of yoyo toys. A man named Duncan was the founder of a yoyo company that he had purchased and then sold his yoyo toys. They are a famous brand.
Slang is slang It's the s' "LANG " uage.
yoyo