A term used to describe a boy who has contracted an STD (Sexual Transmitted Disease). The actual translation of the term boils down a string of 3 simple words, “STD-Ahh-Boy”.
Short for: shut the fuck up dumb ass. Used on internet sites where people get annoying, or even when talking to a friend about someone you don't agree on. (religion for example)
Internet Example:
Person1: I am better than all of you because i was hte second person to join
Person2:stfuda
Friend:
Friend1: The big bang never happened.
Friend2: stfuda it did