1. A Headboard Concussion is when a very promiscuous woman starts to lose the ability to think due to her head repeatedly hitting the headboard during rough sex.
2. A concussion gotten from a woman hitting her head on the headboard during sex.
1. That girl was so slutty she goes to the hospital once a month for a headboard concussion.
2. On my honeymoon I gave my wife a headboard concussion. The marriage didnt go well.