double sporting 

The act of wearing items of clothing representing two different sports teams, typically of different sports, at the same time.

You're not going to wear that Blackhawks jersey with a Steelers cap today, are you? I can't be seen in public with you if you're going to be double sporting.

double sporting by Truck Stop Mama February 20, 2014

double sportin'

When you're screwing two seperate Cougars without them knowing about each other.

My double sportin' days were over when Lacy found out about Melissa.

double sportin' by OERIC January 5, 2009