Bump a song vs bump to a song

More context please.

The "bump" is (or was) a type of dance. Possibly "bumping to a song" could refer to that. "bumping a song" does not have any obvious meaning to me.

MustAskbumping a song

It could mean putting the song at the front of a playing queue so it plays next.
It could mean taking the song out of the show it was written for.

It's virtually impossible in English to provide a paraphrase for three words when context is not provided.

Context?

CJ

Apologies for not providing a context.

Ten years ago everyone was bumping (to) this song in their car.

I made this sentence up myself because I have a hard time remembering where I've heard this phrase before.

MustAskTen years ago everyone was bumping (to) this song in their car.

I'd use "to", but who knows what the young people are saying these days!

To me it suggests the song was very popular, and people liked to play it on their car radios so loud that the car began to rock back and forth (bump) from the vibrations.

MustAskTen years ago everyone was bumping (to) this song in their car.

With "to", I could only guess a meaning -- that people were "dancing" in their cars, causing them to move from side to side and bump each other, probably in time with the music. Without "to" it does not make any sense to me.