It's a kind of onion some rappers like to spin in their music videos. The tradition has evolved from spinning leek, common in other music genres.

Here's where it comes from.

Source. https://www.deviantart.com/dwaynebiddixart/art/RapScallion-905088985

rap scallion

That's a hip-hop vegetable. You mean "rapscallion."

A rake, a knave, a cur, a lout, a scoundrel.

As far as etymology, it's derived from "rascallion", the long form of "rascal", which itself is derived from the French term "rascaille", which refers to a mob.

A mischevious youth.

"Damn hippies" except with a hint of "damn you kids".

A scallion, skilled in freestyle hip-hop

Well, I'm pretty sure it's just one word for starters.

I've always read 'rapscallion' as a sort of youthful miscreant: an almost gender-neutral mildly negative label applied to a person lacking the wisdom of age who is engaged with some slightly rebellious activity.

The word died about the time of ww2, when most of those erstwhile rapscallions became war veterans or casualties.

It's a type of onion that was especially stinky and hard to cook with, then it turned into an insult for rambunctious youth

it's a green onion, with flow.

I got called this by an old guy back when i was a kid in the 90s. Im assuming it means cunt or something like that

Edit: Im in australia, everything means cunt at some point

A rapscallion is a little stinker

A ne'er-do-well scalliwag of the utmost miscreant order.

It's an older generations punk onion.

Vegetable. Same family as pop-tatoes. Usually eaten with rock salt, though some people cooked them with ska-rrots and punkins.

There was a travelling circus that had a lion, and during its performances they noticed it did much better if they played certain kinds of music. This lion was into rap and ska, so they called it rap-ska-lion and rapscallion describes its personality.

One word. Rapscallion.

It's a general insult, like 'low life' or creep' or 'sleazoid.'

An untrustworthy knave.

He's the vegan in a trio with the Rhymenoceros and the Hiphopopotamus.

A person of low character.

a knave

A step above a skallywag.

I'm almost certain it's a fancification of the word rascal. Like some dude in 1750 said 'what's rascal short for?' and his quick witted friend said rapscallion and yada yada now it's a word.

A dastardly sort of fellow

Usually applied to a rambunctious and disobedient child.

A knave.

A cheeky fucker