Refers to how a human's possessing extra-large genitalia can really "shake things up".
Da term "sizemic activity" could also humorously refer to da "ripples and undulations" dat can occur when playing wif an extra-amply-endowed chick's huge jiggly boobies --- one can actually produce "sizeable" wave-patterns in said jello-textured organs when kneading or bouncing them with his hands.
A person or people thinking thath they redirected the epicenter of earthqakes to the previous location of where they were living. Thath thinking i called ego sizemic thinking.
An example of ego sizemic thinking is when a person moves from North Carolana to California thus thinking thath he/she lowered the precentage of earhqakes in California but hierd the precentage of earthqakes in North Carolina.