But it's all right now, in fact, it's a gas!

from The Rolling Stones – Jumping Jack Flash Lyrics on Rap Genius

Meaning

Very aptly put in the blog allmusic

The true “gas” of the song, though, is its irresistible funky rock groove. The extended tag, a typical feature of Rolling Stones classics, finds the group harmonizing on the key line of the chorus in low, semi-comic voices that made it difficult, as always, to determine how seriously they regarded their self-perpetuated bad-boy image.

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