When a topic is presented or being discussed (typically through video) and causes the summoning of a person or people with relation to said topic out of curiosity or interest. It is frequently commented on videos as a joke.

It may be used in different scenarios as well. Its primary purpose is to create a hypothetical awkward and/or funny moment.

The phrase references old time chat rooms with the notice that “____ has entered the chat.”

This joke is parallel to the common phrase: Has left the chat
*Momo Challenge video begins*

FBI has entered the chat.”
“Parent enters the chat.”
by C. Dardano March 5, 2019
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