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Stands for "Shit Fucking Rainbows" When you're down and out or just like "whatever" and through in the towel.
I just lost my job, had my car repossessed, and rent is three weeks late because I needed to eat this week. SFR!
by Darwin March 22, 2015
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n. SFR, which stands for "Spicy Food Resistance" is used to grade how well a person(s) mouth takes to spicy food.

The higher your SFR, the higher the comfort level while eating a hot and spicy food. Your SFR number rating is based on the Scoville scale's 0-16,000,000 unit rating.
My SFR is mearly 6,500! Pete's is close to 35,000!
by Big Dick Chuck September 03, 2007
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A bad company who enjoys blowing up Hyundai's with their hacked tune.
Driver 'I have an SFR tune'
Mechanic 'that will be $3500 tonreplace your blown motor sir'
by TheGdDr November 22, 2018
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