1. The act of talking about sports, camping, fishing, etc. as a way of avoiding any awkward conversations between men.
2. The art of starting a conversation with a complete stranger by discussing assumed common subjects.
I ran into "Jim" after his divorce and asked him about the Michigan game. Perfect guyce breaker, he didn't mention his wife at all.
I met this guy at the bar the other day. He asked me if I was Padres fan. Apparently my hat was a guyce breaker