acronym that stands for "Shut the fuck up, loser."
Sometimes pronounced like "stuff-fool"
<ineedfriends0132> my life sux, y won't u guys be nice to me ur so mean plz be my friend :(
* ineedfriends0132 has left the channel
"Shut the fuck up, lamer."
pronounced stuff-full or s-t-f-u-l
next time you see someone acting lame, tell them to STFUL.