This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

ad. In an extraneous manner.

In an extraneous manner; from without.

"It's just you and the bump da da bump da da bump da da and everything else happening in the song, at least to me, feels like it's happening kind of extraneously, at the top of the song where, once it's loud enough, you can't really register it anyway."

contemporaneously    simultaneously    spontaneously