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Swear to fucking god. As in, I swear that actually happened.
Guy 1: Kevin fucked my sister?
Guy 2: STFG
STFG by KITTYGAL0RE August 31, 2010
Related Words
stmfg stfg SMMFGDH SMFGO SMMFGDHTIFOARDTS somfg Stifgang stmfj Stmfo STMFTGT
Abbreviation for "Stay Thirsty My Friends." This tagline is added at the end of every commercial in an advertising campaign by Dos Equis beer. The campaign features "the most interesting man in the world." Played by actor Jonathan Goldsmith, and narrated by Will Lyman, the commercials tell of the exploits and personality of the main character. The claims attributed to this man are funny because they are so ridiculously exaggerated. They play like a Chuck Norris joke, only with more charm. Fans of the campaign have begun making up their own legends about the man, tagging them with STMF.
His mother has a tattoo that reads, "Son." STMF.

He doesn't swim with sharks, sharks swim with him. STMF.
STMF by T-Smizz April 28, 2010
"Is Drarry Real?"
"I STFG It is!"
STFG by Potteratthedisco June 24, 2016
He didn't say, but I'm guessing he's a member of STMFVI.
STMFVI by Sir Rebrum December 2, 2011
Dos Equis 'Most Interesting Man in The World' commercials: Stay Thirsty My Friend (STMF)
STMF by joojoobean April 29, 2010