Definition

Someone who commits to showing up to social plans and then ghosts you at the last minute with transparently weak excuses. It's the social equivalent of a no-show that ruins group vibes.

Example Usage

Mark said he'd be at the party, but he's such a bottler—he never actually shows up.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=bottler&defid=3650793)