Similar to a Sausage Fest. It is when you are at a party and the guys outnumber the girls at least 4 to 1.
Zack: "Lets get out of this place, there are no girls here"
Mitch: "Yeah this place is a huge dick rub, lets bounce"
in sexy movies when a girl does not undress all the way ,the actor will rub his dick on her entire body
give that blonde a dick rub