John Mastodon

(internet slang, derogatory) A Mastodon user.

Mastocel is a portmanteau of Mastodon (the decentralised social network) and 'cel' — the incel-adjacent suffix implying an involuntary outcast. Used as a derogatory label for Mastodon users, typically by Twitter/X loyalists who view the platform's userbase as overly idealistic, cliquish, or out of touch. The term is niche and carries its mockery lightly — more ribbing than genuine hostility in most usage.

A derogatory internet slang label for a Mastodon user, coined by critics or skeptics of the decentralized social media platform. The -cel suffix (from incel shorthand, repurposed broadly to imply a frustrated or unsuccessful adherent) attaches to the platform name to mock perceived users as socially awkward or self-righteous. Primarily used in tech-culture discourse on Twitter and similar platforms. The suffix -cel, originating in incel communities, has been repurposed across internet culture as a generic marker of perceived social failure or resentment.