Imangina

Noun-
A mental picture formation in a horny mans mind of lady parts.

v.- (Imangina-ing)
In the process of forming the mental picture of female no-no parts

Dude 1: Dude, you have some wood there.
Dude 2: Shit.
Dude 1: Dude... why?
Dude 2: I had an imangina
Dude 1: Ohhh I feel you man.