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 2, 2015
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When you’re so busy and distracted you read a text from a friend but forget to reply until the next day (or later).
Shoot! I thumbled and forgot to reply to you yesterday while I was at work.
by Niim17 October 1, 2021
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portmanteau of Thumb and Rumble, a slang word purportedly used in online gaming.

Seen in a badly researched episode of CSI, where a fat gamer is murdered
"Whenever he's bored, he just goes online. there's always someone looking to thumble"
by NanakoAC February 20, 2013
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A poke at the 16 years it took Tom Brady's dynasty to fall, 1/19/02-1/19/18

R.I.P.
In 2018 before the AFC Championship, QB Tom Brady injured his thumb, social media blew up and took to the name THUMBLE. This is where the word came from.
*stubs thumb on lightswitch*

Mom: THUMBLE!!
by FunnyWords23 January 19, 2018
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To stumble upon something while one is thumbing through a book or some form of media.
She thumbled upon a picture of her younger self from 2002.
by May 1, 2022
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