To Rackstraw a girl is to forcibly tongue wrestle with a paralytically lashed female when perfectly sobre, most often performed by creepy middle-aged men in clubs.
To reverse Rackstraw a girl is to succeed in getting with a sobre female whilst utterly gazeboed. It is a daring and difficult move to perform and requires years of practice to perfect.
A type of underwear made specifically for rockers so that their twig n giggle berries don't experience too much bouncing and chafing while they're rocking their fucking asses off.