Quẩy

No, it's not a swear word. It's just very informal slang. It's perfectly fine to use with friends or in casual social settings.

Sometimes! If a player is doing amazing moves on the field that look like a dance, fans might say they are 'quẩy' on the pitch.

'Nhảy' is the standard word for 'to dance.' 'Quẩy' is slang that implies high energy, loud music, and a party atmosphere.

Mostly, yes. If an older person uses it, they might be trying to sound 'hip' or 'cool,' which can be funny or endearing.

Technically yes, but it usually implies a social activity with music and other people.

Only metaphorically. The way the fried dough twists is like how people twist their bodies when dancing.

It means to party so hard that you 'blow the roof off.' It's an expression for an extremely high-energy party.

Yes! It's very common in texting and social media comments.

The formal version would be 'khiêu vũ' (ballroom dancing) or simply 'nhảy múa' (dancing).

As a noun, it only refers to the food (bánh quẩy). As a slang term, it is almost always a verb.

It refers to 'party people' or people who frequently go to clubs and dance.

Yes, it is universally understood and used throughout Vietnam.