Top definition
Engrossed in your phone or device while being oblivious to the world
It's the worst when you're walking down a crowded sidewalk and you get stuck behind someone walking slowly because they're thumbling.
by Munirih19 September 15, 2014
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2
The act of typing with only your thumbs on all typing devices, I.e. Computer keyboards and other devices through the learned behavior of texting on smaller devices such as cell phones.
Jason thumbled out his term papers on his computer keyboard to the amazement of his parents. "Mom, where are the bandaids? My thumbs are sore from thumbling!"
by Walter eagle December 16, 2010
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3
To accidentally send a "thumbs up" in Facebook messenger while trying to type on the small screen of your phone.
Me: I'm sorry I can't go out, my dog died.
Amy: ┏╮

┃┃
▉━╯┗━╮
▉┈┈┈┈┃
▉╮┈┈┈┃

╰━━━╯
Me: I hope you were just thumbling and not that mean.
by Roshambo187 July 15, 2015
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