STFT Share definition Flag STFT Similar to, STFU. STFT is an abbreviation of Stop the fuckin' typing. Widely used as a replacement in chat sites and forums. n00b: STFU! Person: You can't STFU on the internet, STFT! STFT by HHPLulz October 7, 2009 0 0 Get merch Get the STFT mug. Buy Now — $32.95 See more merch