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1.
what you see exit a mammal upon exhaling in nipply cold weather
Uneducated Girl "Look at me im smoking"
Guys who are always smart "Its not smoke its smeth, your actually smething douche-bag."
by Shenise & Zak June 01, 2007
 
2.
A derogatory term used to describe the odor of amphetamines as they are sweated out of a persons body.

Often used to describe the smell of an individual, but can also be used to describe the smell of a location where they gather.
"That afterhours club reeked of smeth and ass."
by exbouncer415 March 10, 2009