shitpost

Short definition from Wiktionary

Noun

1. 1
   A worthless or superficially meaningless post on a message board, newsgroup, or other online discussion platform, often intended to derail or distract from relevant conversation.
2. 2
   A seemingly worthless or superficially meaningless image, video or piece of text posted to a social media platform that is intended to be humorously or ironically enjoyed.

Verb

1. 1
   To make a shitpost.