1. When an ego metastasizes and move into a testicle. Usually, the normal testicle recesses to feed the larger growth. Frequently it results in a bicycle race through France, 7 of them.
Dude that guy has only one testicle!
Yeah bit its f-en huge!
His egotesticle helps keep his center of gravity low.
e·go·tes·ti·cle
/ˌēɡəˈtestək(ə)l/
adjective
A man who is heavily steeped in masculine energy and excessively conceited or absorbed in oneself; extremely self-centered.
He thinks he's God's gift to women - so egotesticle.