1 definition by KSTORMY
The act of mentally envisioning erotic acts and/or situations in public after viewing an erotic image ie a sexy advertisement or an attractive woman.
Alex: dude, I saw that guy looking at the sports illustrated swimsuit magazine in the gardening section at the bookstore
Kyle: Yeah, he was totally mentalbating
Kyle: Yeah, he was totally mentalbating
by KSTORMY April 5, 2010