Best definition
Wearing The Pants
The act of pwnage in a relationship with a significant other. The member of the relationship wearing pants will

have total control of the other person. Also see pussy whipped

Goat: So wanna come hang out with me and the guys?

Sacktap: Nah, I gotta go out with my girl.

Goat: Dude, what are you doing? Start wearing the pants.
Wearing The Pants: define #2
Wearing the Pants
Luke proposed to Loreal only after she demanded it. Loreal wears the pants.
In their relationship, Loreal is wearIng the pants.
Wearing The Pants: define #3
Wearing the Pants
Wearing the pants refers to the more dominant person in a relationship and one who showers their boyfriend with more love than the he could ever even begin to imagine bestowing upon her. Normally the person who makes the first move at the furniture shop, tells the other person that their dad was once their little brother’s soccer coach, etc, wears the pants. Wearing the pants has absolutely NOTHING to do with the actual size of the pants being worn.
Since I always make important decisions in my relationship, put my foot down, and make our plans, I, obviously, am wearing the pants.