Any cheap, strong alcohol. Orginally ripple was a very strong cider drunk by jazz musicians. Reintroduced by rapper Easy E at the beginning of his seminal work "Easy Does It" when a drunken E slurs out: "Yo bitch, flazzim my ripple!"
"$10? I ain't paying no $10 for some shitty ass ripple bitch!"
"You better check yoself with that ripple...that shit'll make you go blind!"