1 definition by interwebmanx99

Top Definition
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 :(
<coolguyx1035> STFUL
<ineedfriends0132> :(
* ineedfriends0132 has left the channel
by interwebmanx99 June 06, 2004
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