Accidentally bumping the unneccesarily accessible thumbs up/"like" button while using Facebook messenger.
Friend: my dog just got hit by a car.
You: (Thumbs up!)
Friend: .... :|
You: aghhhhh sorry, unintentional thumb
Friend: that thing is unneccesarily accessible.
by LoFrankly March 25, 2015
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When you're on Facebook Messenger and you accidentally hit the "thumb's up button, usually at the worst possible time.
It's going to look something like:

Person: "I'm having a really rough day"
Me: "What's wrong?"
Person: "My dad passed away. 😰"
Me: "👍"
Me: "Goddammit! The unintentional thumb strikes again! ...sorry for your loss."

Example two:
Person 1: "How are things with the hubby?"
Person 2 :"I found out he's cheating on me."

Person 1: "👍"
by Daniel Harmon December 17, 2015
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When you're on Facebook Messenger and you accidentally hit the "thumb's up" button, usually at the worst possible time.
"I'm having a really rough day"

"What's wrong?"

"My dad passed away. 😰"

"👍"

"FUCKING UNINTENTIONAL THUMB! Sorry about your loss."

Or ...

"How are things with Robert?"

"I found out he's cheating on me."

"👍"

"So sorry, the Unintentional Thumb strikes when you least expect it."
by Daniel Harmon December 17, 2015
Get the The Unintentional Thumb mug.