Carrie Underwood - Before He Cheats

bleached-blonde - made blonde by using chemicals
get frisky - become 1 full of energy and fun, 2 sexually excited
souped up - a souped-up car has been made more powerful
Louisville slugger - a well-known baseball bat produced by Hillerich & Bradsby Company. You can read more about it here!
slash - cut something violently with a knife, sword etc.
cheat - behave in a dishonest way in order to win or to get an advantage
white-trash - an insulting expression used to talk about white people who are poor and uneducated
dab on - put a substance onto something with quick light movements of your hand
cheat on sy - be unfaithful to your husband, wife, or sexual partner by secretly having sex with someone else
bathroom cologne (Polo) - in public bathrooms sometimes they have vending machines that dispense a collection of low-grade cologne (perfume or fragrance). According to some sources Underwood sings "bathroom Polo", and it might also be possible, because Polo is the name of a cologne can be bought from these kind of mashines. You can see a video on how it works.