It's incel-speak for dominating someone.
"IQ-mogged" would mean that person A was dominated/overshadowed/etc. by person B because person B is very smart.
"Height-mogged" would mean the same, but due to height.
That I, an old person, know what it means suggests that it has already gone from (1) the incel or whatever community usage, to (2) ironic usage by others, and then finally to (3) widespread usage entirely divorced from the original meaning.
not just "incel" culture, at least not any more
That I, an old person, know what it means suggests that it has already gone from (1) the incel or whatever community usage, to (2) ironic usage by others, and then finally to (3) widespread usage entirely divorced from the original meaning.