This is a result of being delayed in starting a chore, errand, task, etc because something else has to be completed first.
Rudy, I thought you were going to the store.
I am, "but first" I have to make the grocery list.

I was going to clean up the shop; however I got "but firsted" because the shop light was burned out and I had to change the bulb.
by But firsted January 17, 2007
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Something that attention-seeking children write as they desperately seek a feeling of self-worth for being the first to comment on a youtube video.
First!
First like and comment
1st
by AntiRix February 18, 2018
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Being a loser waiting in front of Best Buy for Black Friday sales not even knowing what the sales are just to be first for some bizarre twisted reason and not knowing the real reason for Thanksgiving.
I'm a loser for achieving firstness.
by Katamari671 November 24, 2010
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The transition catch phrase of Big Brother Chenbot.
"Who will be evicted tonight? But first! Mike Boogie is creepy."

"But first!"
by Abe382393493 November 12, 2006
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the first evil; the root of everything that is bad.
The power of good will triump over the first.
by BowTieGirl June 14, 2003
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Used by the very first commenter on a blog or forum to show they beat everyone else to comment first
1st Commenter: "FIRST!"

2nd Commenter: "Omg you are so lame no one cares if you are first congrats on your non-prize winning first comment."
by immatellyouwhat August 01, 2008
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