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1.
slang word used in the dublin music scene. particularily popular amongst skinny scene boys in their late teens. Represents sandwich, but is often used as a type of special private greeting.
"i'd love a cheese sarn, please"

"OI MATE, SARN!"
by sarnboy07 September 10, 2007
 
2.
Anal sex (y)

It's a South Wales term for anal sex - because Sarn is at the rear of Bridgend a town near us.
Gay people like Sarn.
by Sadie Tomlins March 08, 2007
 
3.
S-small
A-annoying
R-retarded
N-nuthead

an adjective that describes the yucky little people
Ew, that guy is such a sarn!
by heheXD January 13, 2008