“Flumps into chair”

“Flumps into chair” the subtitles read.  I was watching Better Call Saul.

“Flump, is that a word?” I asked myself.  Even now autocorrect is putting a red underline beneath it.

According to the Internet, https://www.merriam-webster.com/dictionary/flump, “to move or fall suddenly and heavily.”

Suspicion said I could not trust the Internet.  I sought answers in my hard copy dictionary.  See photo below.  It confirmed that flump, is indeed an English word.

I guess a learned a new word from the subtitles in Better Call Saul.