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1.
"Subway smell" is the staunch odor that soaks into your clothing while eating at a Subway restaurant. Many scientists theorize that this God awful smell is produced by the "fresh" baked bread; however, another competing school of thought theorizes that the stench comes from the chemical preservative liquid that the meats come packed in.

Once the smell has penetrated your clothing, you will inevitably smell like a rotten butthole for the rest of the day. Most people will mistake your newly acquired smell for B.O. unless you are carrying a Subway bag, in which case they will immediately understand the source of the offending odor.
Hey Matt, let's go get a $5 footlong at Subway for lunch.

No way Travis. I've got a date with Sarah tonight, and my chances of getting laid will diminish if I have Subway smell on me.

Yes, that place is an olfactory nightmare.
by LightsOutBrant April 24, 2008
 
2.
The interesting odor that lingers far into the day from a person who has eaten a sandwich from Subway.
Tyler: What smells like B.O.?

Curt: O thats just Marcus, he had a sub Sandwich for lunch and he now has that Subway smell.
by CCCCCCCUUUUUUUURRRRRRRTTTTTTTT January 08, 2009