Means 'Oh Fuck' in portuguese. Made popular when, a famous portuguese singer (who always wears sunglasses in door) fell of stage on national TV, and the show host jumped in the air ninja style while saying 'Ai Fodasse!' (Know as Manzarra), trying to save the singer (known as Pedro Abrunhosa)
a rarely used acronym in IM language. it means:
fainting on dirt, kissing some ass. This acronym is commonly used when people say something funny but also somewhat dirty.