Organization created by Seattle rapper Macklemore. Support real hip-hop by looking beneath the mainstream. Don't be ignorant.
P.S. the person who created the other definition knows nothing about hip-hop. This is evident because he is a fan of Wiz Khalifa, a sellout rapper whose content consists of weed, haters, bitches, money, cars.
A complete fourth meal eaten with friends after a night of drinking, usually at a 24-hour diner between the hours of 2 and 5 AM. Shamefast is a great opportunity to recap what may have been missed (or forgotten) earlier that night.