Let us explain.
Our pawrents are PROUD alumni of the University of South Carolina. The mascot for this school is the Gamecock.
For those of you from the South (US), you know that football is not just a game. It is a way of life. A Religion. People believe in it. They eat, sleep, and breathe it. In our house they "bleed garnet and black". In South Carolina there is a BIG football rivalry. Pretty much everyone in the entire state picks a side. You're either a Gamecock (like us) or a Tiger (Clemson). Last night we played Clemson and won for the third year in a row! Our Dad was so excited we thought he might pee his pants. He hates Clemson. See, that's the thing, if you love the Gamecocks then you have to hate Clemson. There's no other way around it. True Gamecock fans pull for 2 teams- Gamecocks and anyone playing Clemson.
So, the sign in the yard is so that people know where we stand! It's a way to show our Gamecock pride. Go Gamecocks!