Refering to the group of kids from Hoover,Alabama who anually take a glorious ride down the beautiful Cahaba river with cigs, beer and vodka in hand. it consists of 2 champs AKA wrestlers..2 soccer pussys and one shitty baseball player. Every year the group grows which usually ruins the sanctity of the whole trip but its fine..the cahaba river rats will live on forever.
person 1: Did you see those fresh looking kidsfloating down the Cahaba this morning?
An individual who is one with the river. They spend all their time on the water. Most riverrats own a boat and are obsessed with water sports such as swimming, wakeboarding and waterskiing.