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5.
SFR
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
 
1.
sfr
Smiling for real.

Between a 'hehe' and a 'lol'. Mainly used instead of lol, since most people are lying and not actually laughing.
<G> God, you're such an ass
<E> sfr
by GGGD May 03, 2006
 
2.
SFR
SFR is short for Santa Fe Rider, an aging motorcyclist located in Santa Fe, New Mexico who trolls several motorcycle boards angering younger and less experienced members.

His technique is to assume a "you don't know anything" and "I am better than you" attitude.

SFR talking to a board member:

"Who let you out? Go back to the steerage, where you belong"
by Marcelo Vasquez March 10, 2008
 
3.
Sfr
So Fucking Retarded
My teacher is sfr
by TESPA February 09, 2011
 
4.
SFR
"Six Flags Rash". It's the chaffing you get in between your legs when you're at an amusement park all day long, it's 110 degrees outside, your inner thighs are sweating, and there's no barrier between one inner thigh and the other.
He's walking like he's got a bad case of SFR.

Naw, man, I can't play soccer today. I've got some serious SFR.
by superduperme January 28, 2011
 
6.
Single For a REASON
Yeah she's fine, but believe me Dude that Bitch is S.F.R.!
by maplefrost June 27, 2010