Pegasus with the "M"

It is a code word that means "Mega Sus" and it is used when there is a new member in a group or a person acting in a very weird way that seems sus.

Noor: Have you seen the new guy?

Mike: yes I have and he seems off.

Noor: that guy is pegasus with the "M"

Mike: what does that mean?
Noor: it means that she is mega sus
Mike: YESSSS, I felt that